CN104718262A - Adhesive sheet for image display device, method for manufacturing image display device, and image display device - Google Patents
Adhesive sheet for image display device, method for manufacturing image display device, and image display device Download PDFInfo
- Publication number
- CN104718262A CN104718262A CN201380052883.4A CN201380052883A CN104718262A CN 104718262 A CN104718262 A CN 104718262A CN 201380052883 A CN201380052883 A CN 201380052883A CN 104718262 A CN104718262 A CN 104718262A
- Authority
- CN
- China
- Prior art keywords
- adhesive layer
- meth
- image display
- acrylate
- display device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000853 adhesive Substances 0.000 title claims abstract description 119
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 239000012790 adhesive layer Substances 0.000 claims abstract description 216
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims abstract description 131
- 239000010410 layer Substances 0.000 claims abstract description 108
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims abstract description 41
- 230000001681 protective effect Effects 0.000 claims description 54
- 239000000463 material Substances 0.000 claims description 47
- 239000004973 liquid crystal related substance Substances 0.000 claims description 39
- 150000001252 acrylic acid derivatives Chemical class 0.000 claims description 36
- 239000000203 mixture Substances 0.000 claims description 36
- 239000004840 adhesive resin Substances 0.000 claims description 33
- 229920006223 adhesive resin Polymers 0.000 claims description 33
- 229920000642 polymer Polymers 0.000 claims description 21
- 239000003431 cross linking reagent Substances 0.000 claims description 4
- 239000003999 initiator Substances 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 239000000758 substrate Substances 0.000 abstract description 32
- -1 acryl Chemical group 0.000 description 73
- 238000006243 chemical reaction Methods 0.000 description 27
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 24
- 229920000139 polyethylene terephthalate Polymers 0.000 description 23
- 239000005020 polyethylene terephthalate Substances 0.000 description 23
- 239000000178 monomer Substances 0.000 description 21
- 238000005259 measurement Methods 0.000 description 20
- 229920005989 resin Polymers 0.000 description 20
- 239000011347 resin Substances 0.000 description 20
- 230000015572 biosynthetic process Effects 0.000 description 19
- 150000001875 compounds Chemical class 0.000 description 19
- 238000003786 synthesis reaction Methods 0.000 description 19
- 238000011156 evaluation Methods 0.000 description 17
- 238000011049 filling Methods 0.000 description 17
- 239000011521 glass Substances 0.000 description 17
- 229920000058 polyacrylate Polymers 0.000 description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 125000000217 alkyl group Chemical group 0.000 description 13
- 125000004432 carbon atom Chemical group C* 0.000 description 13
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 12
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 12
- 238000003860 storage Methods 0.000 description 12
- STFXXRRQKFUYEU-UHFFFAOYSA-N 16-methylheptadecyl prop-2-enoate Chemical compound CC(C)CCCCCCCCCCCCCCCOC(=O)C=C STFXXRRQKFUYEU-UHFFFAOYSA-N 0.000 description 11
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 11
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 11
- 238000000576 coating method Methods 0.000 description 11
- 230000009477 glass transition Effects 0.000 description 11
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 10
- 229920001577 copolymer Polymers 0.000 description 10
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 10
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 9
- 238000001816 cooling Methods 0.000 description 9
- 239000012528 membrane Substances 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 238000006116 polymerization reaction Methods 0.000 description 9
- 238000004080 punching Methods 0.000 description 9
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 7
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 7
- 230000009467 reduction Effects 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- 238000002834 transmittance Methods 0.000 description 7
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 6
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 6
- 239000000654 additive Substances 0.000 description 6
- 125000002947 alkylene group Chemical group 0.000 description 6
- 239000003112 inhibitor Substances 0.000 description 6
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- NWVVVBRKAWDGAB-UHFFFAOYSA-N p-methoxyphenol Chemical compound COC1=CC=C(O)C=C1 NWVVVBRKAWDGAB-UHFFFAOYSA-N 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- FVQMJJQUGGVLEP-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy 2-ethylhexaneperoxoate Chemical compound CCCCC(CC)C(=O)OOOC(C)(C)C FVQMJJQUGGVLEP-UHFFFAOYSA-N 0.000 description 5
- 239000004925 Acrylic resin Substances 0.000 description 5
- 229920000178 Acrylic resin Polymers 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 5
- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 description 5
- 230000000740 bleeding effect Effects 0.000 description 5
- 210000004027 cell Anatomy 0.000 description 5
- 239000012975 dibutyltin dilaurate Substances 0.000 description 5
- 230000008034 disappearance Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 5
- 229910052753 mercury Inorganic materials 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- 239000012956 1-hydroxycyclohexylphenyl-ketone Substances 0.000 description 4
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 4
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 4
- SXIFAEWFOJETOA-UHFFFAOYSA-N 4-hydroxy-butyl Chemical group [CH2]CCCO SXIFAEWFOJETOA-UHFFFAOYSA-N 0.000 description 4
- NDWUBGAGUCISDV-UHFFFAOYSA-N 4-hydroxybutyl prop-2-enoate Chemical compound OCCCCOC(=O)C=C NDWUBGAGUCISDV-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 239000011889 copper foil Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- RBQRWNWVPQDTJJ-UHFFFAOYSA-N methacryloyloxyethyl isocyanate Chemical compound CC(=C)C(=O)OCCN=C=O RBQRWNWVPQDTJJ-UHFFFAOYSA-N 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 229920006254 polymer film Polymers 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000004381 surface treatment Methods 0.000 description 4
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 3
- GUCYFKSBFREPBC-UHFFFAOYSA-N [phenyl-(2,4,6-trimethylbenzoyl)phosphoryl]-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C(=O)C1=C(C)C=C(C)C=C1C GUCYFKSBFREPBC-UHFFFAOYSA-N 0.000 description 3
- 230000003373 anti-fouling effect Effects 0.000 description 3
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical class C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229920001515 polyalkylene glycol Polymers 0.000 description 3
- 229920001223 polyethylene glycol Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 229920001451 polypropylene glycol Polymers 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 239000005361 soda-lime glass Substances 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 2
- 125000004066 1-hydroxyethyl group Chemical group [H]OC([H])([*])C([H])([H])[H] 0.000 description 2
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 2
- XMLYCEVDHLAQEL-UHFFFAOYSA-N 2-hydroxy-2-methyl-1-phenylpropan-1-one Chemical compound CC(C)(O)C(=O)C1=CC=CC=C1 XMLYCEVDHLAQEL-UHFFFAOYSA-N 0.000 description 2
- QOXOZONBQWIKDA-UHFFFAOYSA-N 3-hydroxypropyl Chemical group [CH2]CCO QOXOZONBQWIKDA-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 239000005058 Isophorone diisocyanate Substances 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- LFOXEOLGJPJZAA-UHFFFAOYSA-N [(2,6-dimethoxybenzoyl)-(2,4,4-trimethylpentyl)phosphoryl]-(2,6-dimethoxyphenyl)methanone Chemical compound COC1=CC=CC(OC)=C1C(=O)P(=O)(CC(C)CC(C)(C)C)C(=O)C1=C(OC)C=CC=C1OC LFOXEOLGJPJZAA-UHFFFAOYSA-N 0.000 description 2
- 125000002723 alicyclic group Chemical group 0.000 description 2
- WURBFLDFSFBTLW-UHFFFAOYSA-N benzil Chemical class C=1C=CC=CC=1C(=O)C(=O)C1=CC=CC=C1 WURBFLDFSFBTLW-UHFFFAOYSA-N 0.000 description 2
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 2
- 239000012965 benzophenone Substances 0.000 description 2
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- 239000003990 capacitor Substances 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- VFHVQBAGLAREND-UHFFFAOYSA-N diphenylphosphoryl-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C1=CC=CC=C1 VFHVQBAGLAREND-UHFFFAOYSA-N 0.000 description 2
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
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- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
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- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical compound C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 description 2
- DTGKSKDOIYIVQL-WEDXCCLWSA-N (+)-borneol Chemical group C1C[C@@]2(C)[C@@H](O)C[C@@H]1C2(C)C DTGKSKDOIYIVQL-WEDXCCLWSA-N 0.000 description 1
- QNODIIQQMGDSEF-UHFFFAOYSA-N (1-hydroxycyclohexyl)-phenylmethanone Chemical compound C=1C=CC=CC=1C(=O)C1(O)CCCCC1 QNODIIQQMGDSEF-UHFFFAOYSA-N 0.000 description 1
- DVFAVJDEPNXAME-UHFFFAOYSA-N 1,4-dimethylanthracene-9,10-dione Chemical compound O=C1C2=CC=CC=C2C(=O)C2=C1C(C)=CC=C2C DVFAVJDEPNXAME-UHFFFAOYSA-N 0.000 description 1
- DKEGCUDAFWNSSO-UHFFFAOYSA-N 1,8-dibromooctane Chemical compound BrCCCCCCCCBr DKEGCUDAFWNSSO-UHFFFAOYSA-N 0.000 description 1
- LMGYOBQJBQAZKC-UHFFFAOYSA-N 1-(2-ethylphenyl)-2-hydroxy-2-phenylethanone Chemical compound CCC1=CC=CC=C1C(=O)C(O)C1=CC=CC=C1 LMGYOBQJBQAZKC-UHFFFAOYSA-N 0.000 description 1
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- XIOGJAPOAUEYJO-UHFFFAOYSA-N 2-(2-methoxyphenyl)-4,5-diphenyl-1h-imidazole Chemical class COC1=CC=CC=C1C1=NC(C=2C=CC=CC=2)=C(C=2C=CC=CC=2)N1 XIOGJAPOAUEYJO-UHFFFAOYSA-N 0.000 description 1
- SNFCQJAJPFWBDJ-UHFFFAOYSA-N 2-(4-methoxyphenyl)-4,5-diphenyl-1h-imidazole Chemical class C1=CC(OC)=CC=C1C1=NC(C=2C=CC=CC=2)=C(C=2C=CC=CC=2)N1 SNFCQJAJPFWBDJ-UHFFFAOYSA-N 0.000 description 1
- GZYZPHPDKCTFFH-UHFFFAOYSA-N 2-(4-methylsulfanylphenyl)-4,5-diphenyl-1h-imidazole Chemical class C1=CC(SC)=CC=C1C1=NC(C=2C=CC=CC=2)=C(C=2C=CC=CC=2)N1 GZYZPHPDKCTFFH-UHFFFAOYSA-N 0.000 description 1
- GJKGAPPUXSSCFI-UHFFFAOYSA-N 2-Hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone Chemical compound CC(C)(O)C(=O)C1=CC=C(OCCO)C=C1 GJKGAPPUXSSCFI-UHFFFAOYSA-N 0.000 description 1
- LCZVSXRMYJUNFX-UHFFFAOYSA-N 2-[2-(2-hydroxypropoxy)propoxy]propan-1-ol Chemical compound CC(O)COC(C)COC(C)CO LCZVSXRMYJUNFX-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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- C08F290/08—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated side groups
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- B32B2551/00—Optical elements
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
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- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- General Chemical & Material Sciences (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Laminated Bodies (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
An adhesive sheet (1) for an image display device that comprises a film-type adhesive layer (2) and a pair of substrate layers (3, 4) layered so as to sandwich the adhesive layer (2), wherein the adhesive layer (2) contains a structural unit derived from stearyl (meth)acrylate as the main component and has a haze of 1.5% or lower.
Description
Technical Field
The invention relates to an adhesive sheet for an image display device, a method for manufacturing the image display device, and the image display device.
Background
In recent years, the following methods have been proposed: a space between a transparent protective plate or an information input device (for example, a touch panel) in an image display device and a display surface of an image display unit or a space between the transparent protective plate and the information input device is replaced with a transparent material having a refractive index closer to that of the transparent protective plate, the information input device, and the display surface of the image display unit than that of air, thereby improving the transmittance and suppressing the reduction in luminance and contrast of the image display device (for example, patent document 1). Fig. 24 illustrates a schematic view of a liquid crystal display device as an example of an image display device. A liquid crystal display device incorporating a touch panel is composed of a transparent protective plate (glass or plastic substrate) D1, a touch panel D2, a polarizing plate D3, and a liquid crystal display cell D4, and in order to prevent cracking of the liquid crystal display device, alleviate stress and impact, and improve visibility, an adhesive layer D5 may be provided between the transparent protective plate and the touch panel, and an adhesive layer D6 may be provided between the touch panel and the polarizing plate.
However, in the information input device and the image display unit, it is necessary to provide input/output wirings in the peripheral portion thereof, and in order to make these wirings invisible from the transparent protective plate surface side, a frame-shaped decorative portion D7 (19 (frame pattern) in fig. 1A of patent document 1) as shown in fig. 25 is generally provided in the peripheral portion of the transparent protective plate by printing or the like. In order to eliminate the step caused by these decorative parts, for example, a film-like adhesive is used as the adhesive for bonding the transparent protective plate, but the film-like adhesive is required to have excellent step filling property in order to fill the vicinity of the step without a space. In recent years, various film-like adhesives have been studied for improving such level difference filling properties (for example, patent documents 2 and 3).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2008-83491
Patent document 2: japanese laid-open patent publication No. 2010-163591
Patent document 3: international publication No. 2012/077806
Disclosure of Invention
Technical problem to be solved by the invention
However, according to the results of investigation by the present inventors, it was found that the film-like adhesive D9 described in patent documents 2 and 3 had poor surface flatness (large Δ t in fig. 25) in the portions between the step portion and the non-step portion when it was laminated to the adherend D8 having the step portion D7. When the surface flatness is poor, the adhesive is expected to deform when it is stuck to an adherend such as a touch panel, which causes display unevenness and reduces visibility.
On the other hand, in recent years, a capacitance type touch panel is often used in a portable electronic terminal represented by a cellular phone. In the capacitive touch panel, a capacitor formed between the touch panel and a fingertip plays an important role. If an adhesive layer is formed between the transparent protective plate and the capacitive touch panel, the dielectric constant of the adhesive layer is generally higher than that of air, and therefore the capacitance of a capacitor formed between the touch panel and a fingertip increases, which may affect the operability. As a result of studies by the present inventors, in the case where an adhesive layer is present between a transparent protective plate of an image display device or the like and a capacitive touch panel, it has been found that the film-like adhesive described in patent document 2 and patent document 3 has a large dielectric constant and is likely to be disadvantageous in design from the viewpoint of workability of the capacitive touch panel.
The present invention has been made in view of the above circumstances, and an object thereof is to provide an adhesive sheet for an image display device, which is provided with an adhesive layer having excellent filling properties for a step portion formed on an object to be adhered, excellent surface flatness, an appropriate dielectric constant, and excellent visibility. Another object of the present invention is to provide a method for manufacturing an image display device using the adhesive sheet for an image display device, and an image display device.
Means for solving the technical problem
The present inventors have intensively studied to solve the above problems, and as a result, they have found that the above problems can be solved if an adhesive sheet is provided with an adhesive layer which is formed from an adhesive resin composition containing a structural unit derived from stearyl (meth) acrylate as a main component and has specific physical properties. The present invention has been completed based on such findings.
Specifically, the present invention provides an adhesive sheet for an image display device, which comprises an adhesive layer and a pair of base material layers laminated so as to sandwich the adhesive layer, wherein the adhesive layer contains a structural unit derived from stearyl (meth) acrylate as a main component, and the haze of the adhesive layer is 1.5% or less.
According to such an adhesive sheet for an image display device (hereinafter, may be simply referred to as "adhesive sheet"), the adhesive sheet can be easily stored and transported without damaging the adhesive layer. Further, the adhesive layer mainly contains a structural unit derived from stearyl (meth) acrylate, whereby both the step-fill property and the suppression of the bleeding of the adhesive material when the adhesive layer is left to stand after being bonded to the adhesive material can be achieved.
The present invention also provides an adhesive sheet for an image display device, comprising an adhesive layer, a1 st and a2 nd base material layers laminated so as to sandwich the adhesive layer, and a carrier layer further laminated on the 2 nd base material layer, wherein outer edges of the 1 st base material layer and the carrier layer protrude outward from an outer edge of the adhesive layer, the adhesive layer contains a structural unit derived from stearyl (meth) acrylate as a main component, and the adhesive layer has a haze of 1.5% or less.
According to such an adhesive sheet, the outer edges of the 1 st base layer and the carrier layer which become the outer layers preferably protrude outward from the outer edges of the adhesive layer which becomes the inner layer. This makes it possible to reliably protect the outer edge of the adhesive layer when the adhesive sheet is stored and transported. In addition, when the adhesive layer is adhered to the adherend, the carrier layer can be easily peeled from the 2 nd base material layer by grasping the outer edge portion of the carrier layer protruding outward. Next, the 1 st base material layer can be easily peeled off by grasping the outer edge portion of the 1 st base material layer. In this case, since only the 2 nd base material layer remains on one side of the adhesive layer, when one surface of the adhesive layer is attached to an object to be adhered, the 2 nd base material layer can maintain the protection of the adhesive layer. After that, the 2 nd base material layer is peeled off, and the other surface of the adhesive layer is bonded to another object to be bonded, whereby the adhesive layer can be disposed between the pair of objects to be bonded.
The thickness of the adhesive layer in these adhesive sheets is preferably 1.0 × 102μm～5.0×102And mu m. Thereby, impact resistance and visibility become excellent.
In addition, the adhesive layer in the adhesive sheets preferably has a tan of 1.2 to 2 at 40 to 80 ℃. This makes the level difference filling property and the surface flatness more excellent.
Further, the adhesive layer in these adhesive sheets is preferably: the adhesive resin composition is formed by an adhesive resin composition containing (A) an acrylic acid derivative polymer, (B) an acrylic acid derivative, (C) a cross-linking agent and (D) a photopolymerization initiator, wherein the (A) acrylic acid derivative polymer contains a structural unit derived from stearyl (meth) acrylate, and the (B) acrylic acid derivative contains stearyl (meth) acrylate.
The present invention also provides a method for manufacturing an image display device, including the steps of: a step of obtaining a laminate by bonding objects to be bonded to each other via an adhesive layer provided in the adhesive sheet; a step of heating and pressurizing the laminate at 40 to 80 ℃ and 0.3 to 0.8 MPa; and a step of irradiating the laminate with ultraviolet light from one side of any one of the adherends.
By using the adhesive sheet of the present invention, for example, an image display unit such as a liquid crystal display unit and a touch panel, such an image display unit and a transparent protective plate, and an image display unit such as a touch panel and a transparent protective plate and other members (optical members and the like) necessary for an image display device can be bonded to each other. The present invention can be particularly preferably used when the object to be adhered is a transparent protective plate and a touch panel, or a transparent protective plate and an image display unit. Similarly, by using the adhesive sheet of the present invention, members on the visible side of the image display unit can be bonded to each other. In this case, even if the transparent protective plate on the visible side has a step portion along its outer peripheral edge, for example, the adhesive layer can reliably fill the step portion, and the surface flatness of the step portion attachment is excellent, so that the visibility is not lowered.
The present invention also provides an image display device having a laminate comprising an image display unit, a transparent protective plate, and an adhesive layer present between the image display unit and the transparent protective plate, wherein the adhesive layer contains a structural unit derived from stearyl (meth) acrylate as a main component, and the adhesive layer has a haze of 1.5% or less.
The present invention also provides an image display device having a laminate comprising an image display unit, a touch panel, a transparent protective plate, and an adhesive layer present between the touch panel and the transparent protective plate, wherein the adhesive layer contains a structural unit derived from stearyl (meth) acrylate as a main component, and the adhesive layer has a haze of 1.5% or less. The adhesive layer is excellent in filling with steps and surface flatness, and therefore is particularly suitable for the case where the transparent protective plate has steps.
Such an image display device of the present invention has both excellent impact resistance and visibility.
Effects of the invention
According to the present invention, an adhesive sheet for an image display device can be provided which has excellent filling properties for a step portion formed on an object to be adhered, has excellent surface flatness, has an appropriate dielectric constant, and has excellent visibility. The present invention can also provide a method for manufacturing an image display device using such an adhesive sheet, and an image display device.
Drawings
Fig. 1 is a perspective view showing one embodiment of the adhesive sheet (3-layer product) of the present invention.
Fig. 2 is a sectional view showing one embodiment of the adhesive sheet (3-layer product) of the present invention.
FIG. 3 is a cross-sectional view of a base material film.
FIG. 4 is a sectional view showing a cutting step of the base material film.
FIG. 5 is a sectional view showing a process of removing unnecessary portions of the base material film.
Fig. 6 is a sectional view showing a step of removing the temporary separator.
Fig. 7 is a sectional view showing a step of attaching the light peeling separator.
Fig. 8 is a cross-sectional view showing an embodiment of an image display device.
Fig. 9 is a cross-sectional view showing an embodiment of an image display device.
Fig. 10 is a sectional view showing a peeling step of the light peeling separator.
Fig. 11 is a sectional view showing a step of attaching the adhesive surface to the adherend.
Fig. 12 is a sectional view showing a peeling step of the heavy peeling separator.
Fig. 13 is a sectional view showing a step of attaching the adhesive surface to the adherend.
Fig. 14 is a perspective view showing one embodiment of the adhesive sheet (4-layer product) of the present invention.
Fig. 15 is a side view showing one embodiment of the adhesive sheet (4-layer product) of the present invention.
FIG. 16 is a sectional view of a base material film.
FIG. 17 is a sectional view showing a cutting step of the base material film.
FIG. 18 is a sectional view showing a step of removing an unnecessary portion of the base material film.
FIG. 19 is a sectional view showing a step of removing an unnecessary portion of the base material film.
Fig. 20 is a sectional view showing a step of removing the temporary separator.
Fig. 21 is a sectional view showing a step of attaching the light peeling separator.
Fig. 22 is a sectional view showing a peeling step of the carrier film.
Fig. 23 is a schematic diagram showing a sample measurement method using a wide-area dynamic viscoelasticity measurement apparatus.
Fig. 24 is a cross-sectional view showing an embodiment of an image display device.
Fig. 25 is a schematic view showing surface flatness when a conventional adhesive sheet is used.
Detailed Description
Preferred embodiments (first embodiment and second embodiment) of the present invention will be described below, but the present invention is not limited to these embodiments at all. Note that, description overlapping with the two embodiments is only described in the first embodiment, and description in the second embodiment is omitted as appropriate. In the present specification, "(meth) acrylate" means "acrylate" and "methacrylate" corresponding thereto. Similarly, "(meth) acrylic acid" means "acrylic acid" and "methacrylic acid" corresponding thereto, and "(meth) acryl" means "acryl" and "methacryl" corresponding thereto.
[ first embodiment ]
< adhesive sheet for image display device I >
The adhesive sheet for an image display device of the present embodiment includes an adhesive layer and a pair of base material layers laminated so as to sandwich the adhesive layer. The outer edge of the base material layer preferably protrudes further to the outside than the outer edge of the adhesive layer.
That is, as shown in fig. 1 and 2, the adhesive sheet 1 (3-layer product) of the present embodiment includes a transparent film-like adhesive layer 2, and a heavy release separator 3 (one base material layer) and a light release separator 4 (the other base material layer) sandwiching the adhesive layer 2. The adhesive layer 2 is a transparent film disposed between a transparent protective plate and a touch panel or between a touch panel and a liquid crystal display unit in an image display device such as a touch panel display for a mobile terminal, for example.
The adhesive layer 2 is formed of an adhesive resin composition containing a structural unit derived from stearyl (meth) acrylate as a main component. Therefore, in addition to the adhesive force, the surface flatness is further improved, and the dielectric constant can be set to an appropriate value.
In the adhesive layer 2, the structural unit derived from stearyl (meth) acrylate may be derived from a polymer component constituting the adhesive resin composition or may be derived from a monomer component. That is, the structural unit may be provided to the adhesive resin composition by including a skeleton derived from stearyl (meth) acrylate in the polymer component, or may be provided by including stearyl (meth) acrylate in the monomer component. Among these, the structural unit derived from both the polymer component and the monomer component is preferable from the viewpoint of improving the transparency of the adhesive layer 2.
The structural unit derived from stearyl (meth) acrylate is the main component of the adhesive layer 2. The main component in the present invention means the largest component among the components constituting the adhesive layer 2.
The content of the structural unit derived from stearyl (meth) acrylate is preferably 50% by mass or more, more preferably 60% by mass or more, and still more preferably 70% by mass or more, relative to the total mass, from the viewpoint of surface flatness and reduction in dielectric constant. From the same viewpoint, the content is preferably 95% by mass or less, more preferably 90% by mass or less, and further preferably 85% by mass or less.
The adhesive layer 2 preferably has the following physical properties. That is, since the adhesive layer 2 is used for an image display device, the haze needs to be 1.5% or less. From the viewpoint of visibility, the haze is preferably 1.0% or less, more preferably 0.8% or less, and further preferably 0.5% or less. The lower limit value of the haze is preferably close to 0%, but is usually larger than 0%, and is 0.1% or more from the viewpoint of practical use.
The haze depends on the compatibility between the components (A), (B) and (C) described later. When the compatibility between the component (A), the component (B) and the component (C) is good, the haze can be reduced. The haze is set to 1.5% or less by the following method, for example.
1) When stearyl (meth) acrylate is contained in the constituent unit as a main component of component (a) described later, a compound having a polar group such as a hydroxyl group-containing (meth) acrylate or an alkylene glycol chain-containing (meth) acrylate is not selected as component (B), or the content thereof is reduced even if selected.
2) The component (A) described later contains stearyl (meth) acrylate as a main component and stearyl (meth) acrylate as a constitutional unit, and the component (C) contains a high-molecular-weight component (weight-average molecular weight: 2.0X 10)3In the above case, the component (C) is selected from those mainly containing an alkyl group or alkylene group having 9 to 18 carbon atoms.
3) When stearyl (meth) acrylate is contained in the constituent unit as the main component of the component (A) described later, a low-molecular weight component (having a weight-average molecular weight of less than 2.0X 10) is selected as the component (C)3)。
The haze is a value (%) representing the haze, which is obtained from the total transmittance T of light transmitted through the sample by irradiation with a lamp and the transmittance D of light diffused and scattered in the sample, in accordance with (D/T) × 100. This is defined in JIS K7136 and can be easily measured by a commercially available turbidimeter, for example, NDH-5000 manufactured by Nippon Denshoku industries Co., Ltd.
In addition, the adhesive layer 2 preferably has a tan at 40 to 80 ℃ of 1.2 or more, more preferably 1.3 or more, and even more preferably 1.4 or more, from the viewpoint of improving the step filling property and the surface flatness. On the other hand, from the viewpoint of improving film forming properties, the adhesive layer 2 preferably has a tan of 2 or less, more preferably 1.9 or less, and still more preferably 1.8 or less at 40 to 80 ℃.
Here, tan is a value obtained by dividing the loss elastic modulus by the shear storage elastic modulus, and the loss elastic modulus and the shear storage elastic modulus are values measured by a wide-area dynamic viscoelasticity measuring apparatus. The glass transition temperature (Tg), the loss modulus of elasticity and the shear storage modulus of elasticity are specifically values measured by the following methods.
(measurement of glass transition temperature, loss modulus of elasticity and shear storage modulus of elasticity)
The glass transition temperature, loss elastic modulus and shear storage elastic modulus can be determined as follows: an adhesive layer having a thickness of 0.5mm, a width of 10mm and a length of 10mm was prepared, and measurement was performed under the conditions of "share sandwich mode (share sandwich mode), frequency of 1.0Hz, measurement temperature range of-20 to 100 ℃ and temperature rise rate of 5 ℃/min" using a wide area dynamic viscoelasticity measurement apparatus (manufactured by Rheometric Scientific, Solids Analyzer RSA-II).
The adhesive layer 2 preferably has a shear storage elastic modulus at 25 ℃ of 5.0X 104Pa or more, more preferably 8.0X 104Pa or above. The adhesive layer 2 preferably has a shear storage modulus of 5.0X 10 at 25 ℃5Pa or less, more preferably 3.5X 105Pa or less. By setting the shear storage elastic modulus at 25 ℃ in this range, the storage stability can be further improvedHigh level difference landfill property and exudation property.
The glass transition temperature of the pressure-sensitive adhesive layer 2 is preferably 0 ℃ or higher, more preferably 10 ℃ or higher, and still more preferably 20 ℃ or higher. When the glass transition temperature is 0 ℃ or higher, bleeding properties can be further suppressed, and when a light peeling separator 4 described later is peeled, the film formability tends to be well maintained because good peeling is facilitated. On the other hand, the glass transition temperature of the pressure-sensitive adhesive layer 2 is preferably 50 ℃ or lower, more preferably 45 ℃ or lower. When the glass transition temperature is 50 ℃ or lower, the adhesiveness and the step filling property tend to be improved. The glass transition temperature in the present application is a temperature at which tan exhibits a peak within the above measurement temperature range. However, when 2 or more tan peaks are observed in this temperature range, the glass transition temperature is set to a temperature at which the tan value exhibits a maximum value.
The thickness of the adhesive layer 2 is not particularly limited since it can be appropriately adjusted according to the use and method, but is preferably 1.0 × 102μ m or more, more preferably 1.2X 102μ m or more, more preferably 1.3X 102More than μm. Further, it is preferably 5.0X 102μ m or less, more preferably 3.5X 102μ m or less, more preferably 3.0X 102And is less than μm. When used in this range, the adhesive sheet exhibits particularly excellent effects as a transparent adhesive sheet for bonding an optical member to a display.
When the adhesive layer 2 is used between the touch panel and the transparent protective plate, the dielectric constant of the adhesive layer at room temperature (25 ℃) and 100kHz is preferably 2 or more from the viewpoint of ensuring the response of the touch panel. On the other hand, from the viewpoint of reducing the possibility of occurrence of erroneous operation due to excessively high responsiveness, it is preferably 4 or less, more preferably 3.5 or less, and still more preferably 3.2 or less.
The adhesive layer 2 is formed, for example, as follows: the heavy peeling diaphragm 3 is coated with a coating composition containing the stearyl (meth) acrylate component and optionallyThe adhesive resin composition containing a component having a (meth) acryloyl group is formed by curing the composition by irradiation with an active energy ray and then shearing the cured composition into a desired size. As the light source of the active energy ray, a light source having an emission distribution at a wavelength of 400nm or less is preferable, and for example, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a chemical lamp, an invisible lamp, a metal halide lamp, and a microwave-excited mercury lamp can be used. The irradiation energy is not particularly limited, but is preferably 1.6 × 102mJ/cm2More preferably 1.8X 10 or more2mJ/cm2More preferably 2.0X 10 or more2mJ/cm2The above. In addition, it is preferably 6.5X 102mJ/cm2The following, more preferably 6.0X 102mJ/cm2The following, more preferably 5.0X 102mJ/cm2The following.
The adhesive resin composition preferably contains (a) an acrylic acid derivative polymer, (B) an acrylic acid derivative, (C) a crosslinking agent, and (D) a photopolymerization initiator.
The adhesive resin composition will be described below.
[ (A) ingredient: (A) acrylic acid derivative polymers
(A) The acrylic acid derivative polymer is a product obtained by polymerizing 1 kind of monomer having 1 (meth) acryloyl group in the molecule or copolymerizing 2 or more kinds of monomers in combination. The component (a) may be a copolymer obtained by copolymerizing a compound having 2 or more (meth) acryloyl groups in the molecule or a polymerizable compound having no (meth) acryloyl group (a compound having 1 or more polymerizable unsaturated bonds in the molecule such as acrylonitrile, styrene, vinyl acetate, ethylene, propylene, or a compound having 2 or more polymerizable unsaturated bonds in the molecule such as divinylbenzene) with a (meth) acrylic derivative polymer, as long as the effects of the present embodiment are not impaired.
Examples of the monomer having 1 (meth) acryloyl group in the molecule to form the component (a) include (meth) acrylic acid; (meth) acrylamide; (meth) acryloyl morpholine; alkyl (meth) acrylates having an alkyl group of 1 to 18 carbon atoms such as methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, tert-butyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isodecyl (meth) acrylate, dodecyl (meth) acrylate, n-lauryl (meth) acrylate, and stearyl (meth) acrylate; (meth) acrylates having an aromatic ring such as benzyl (meth) acrylate and phenoxyethyl (meth) acrylate; (meth) acrylates having an alicyclic group such as cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, and dicyclopentanyl (meth) acrylate; tetrahydrofurfuryl (meth) acrylate; (meth) acrylamide derivatives such as N, N-dimethylaminoethyl (meth) acrylate, N-dimethylaminopropyl (meth) acrylamide, N-dimethyl (meth) acrylamide, N-isopropyl (meth) acrylamide, N-diethyl (meth) acrylamide, and N-hydroxyethyl (meth) acrylamide; (meth) acrylates having an isocyanate group such as 2- (2-methacryloyloxyethyloxy) ethyl isocyanate and 2- (meth) acryloyloxyethyl isocyanate; and alkylene glycol chain-containing (meth) acrylates.
(A) Component (b) preferably contains stearyl (meth) acrylate as a monomer component. (A) When the component (c) is a copolymer, the content of stearyl (meth) acrylate is preferably 50% by mass or more, more preferably 60% by mass or more, and still more preferably 70% by mass or more, based on the total mass of the copolymer. Further, it is preferably 98% by mass or less, more preferably 95% by mass or less, and further preferably 90% by mass or less. When the content ratio of stearyl (meth) acrylate is in such a range, the adhesion between the adhesive layer and the transparent protective plate (glass substrate, plastic substrate, or the like) and the surface flatness are further improved, and the dielectric constant can be further reduced. Such a copolymer can be obtained by blending the monomers in the same ratio as the above-mentioned content ratio and copolymerizing the monomers. Further, the polymerization rate is more preferably substantially close to 100%.
Examples of the stearyl (meth) acrylate include n-stearyl (meth) acrylate (also referred to as stearyl (meth) acrylate) and isostearyl (meth) acrylate, and isostearyl (meth) acrylate is more preferable. The isostearyl (meth) acrylate is particularly preferably isostearyl having a large number of branches. These stearyl (meth) acrylates may also be used in combination with 2 or more.
The other monomer copolymerizable with stearyl (meth) acrylate is not limited to those described above, but is preferably a monomer having a polar group such as a hydroxyl group, a morpholino group, an amino group, a carboxyl group, a cyano group, a carbonyl group, a nitro group, or a group derived from an alkylene glycol. The (meth) acrylate having such a polar group improves the adhesion between the adhesive layer and the transparent protective plate, and also improves the reliability under high-temperature and high-humidity conditions.
In particular, stearyl (meth) acrylate is preferably used in combination with an alkylene glycol chain-containing (meth) acrylate represented by the following formula (x).
CH2＝CXCOO(CpH2pO)qR (x)
In the formula (X), X represents a hydrogen atom or a methyl group, R represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, p represents an integer of 2 to 4, and q represents an integer of 1 to 10.
Examples of the alkylene glycol chain-containing (meth) acrylate represented by the formula (x) include hydroxyl group-containing (meth) acrylates such as 2-hydroxyethyl (meth) acrylate, 1-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 1-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 1-hydroxybutyl (meth) acrylate; polyethylene glycol mono (meth) acrylates such as diethylene glycol mono (meth) acrylate, triethylene glycol mono (meth) acrylate, tetraethylene glycol mono (meth) acrylate, and hexaethylene glycol mono (meth) acrylate; polypropylene glycol mono (meth) acrylates such as dipropylene glycol mono (meth) acrylate, tripropylene glycol mono (meth) acrylate, and octapropylene glycol mono (meth) acrylate; polybutylene glycol mono (meth) acrylates such as dibutylene glycol mono (meth) acrylate and tributylene glycol mono (meth) acrylate; methoxy polyethylene glycol (meth) acrylates such as methoxy triethylene glycol (meth) acrylate, methoxy tetraethylene glycol (meth) acrylate, methoxy hexaethylene glycol (meth) acrylate, methoxy octaethylene glycol (meth) acrylate, and methoxy nonaethylene glycol (meth) acrylate; and alkoxy polyalkylene glycol (meth) acrylates such as methoxy heptapropylene glycol (meth) acrylate, ethoxy tetraethylene glycol (meth) acrylate, butoxy ethylene glycol (meth) acrylate, and butoxy diethylene glycol (meth) acrylate. Among these, 2-hydroxyethyl (meth) acrylate, 1-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 1-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 1-hydroxybutyl (meth) acrylate are preferable, 2-hydroxyethyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate are more preferable, and 2-hydroxyethyl (meth) acrylate is further preferable. These alkylene glycol chain-containing (meth) acrylates may be used in combination of 2 or more.
(A) The weight average molecular weight of the component (A) is a value obtained by Gel Permeation Chromatography (GPC) and conversion using a calibration curve of standard polystyrene, and is preferably 1.5X 104More preferably 2.0X 10 or more4More preferably 2.5X 10 or more4The above. The weight average molecular weight of the component is 1.5 × 104In the above case, the adhesive layer having an adhesive force with which peeling of the transparent protective plate or the like is less likely to occur can be obtained. On the other hand, the weight average molecular weight of this component is preferably 3.0X 105The following, more preferably 2.0X 105The following, more preferably 1.0X 105The following. The weight average molecular weight of the component is 3.0 × 105In the following case, the viscosity of the adhesive resin composition does not become too high, and the processability in the case of forming a sheet-like adhesive layer becomes betterGood results are obtained.
As the polymerization method of the component (a), known polymerization methods such as solution polymerization, emulsion polymerization, suspension polymerization, bulk polymerization, and the like can be used.
As the polymerization initiator in polymerizing the component (a), a compound which generates a radical by heat can be used. Specific examples thereof include organic peroxides such as benzoyl peroxide, lauroyl peroxide, and t-butyl peroxy-2-ethylhexanoate; azo compounds such as 2,2 '-azobisisobutyronitrile and 2, 2' -azobis (2-methylbutyronitrile).
(A) The content of the component (b) is preferably 30% by mass or more, more preferably 40% by mass or more, and further preferably 45% by mass or more, based on the total mass of the adhesive resin composition. The content of this component is preferably 90% by mass or less, more preferably 80% by mass or less, and still more preferably 70% by mass or less, based on the total mass of the adhesive resin composition. (A) When the content of the component (b) is in this range, the viscosity of the adhesive resin composition falls within an appropriate viscosity range for forming an adhesive layer, and the processability becomes better. In addition, the obtained adhesive layer has better adhesion to transparent protective plates such as glass substrates and plastic substrates and surface flatness.
[ (B) ingredient: acrylic acid derivatives
(B) The acrylic acid derivative is a (meth) acrylic acid derivative monomer having 1 (meth) acryloyl group in the molecule, and examples thereof include the same compounds as exemplified as the monomer having 1 (meth) acryloyl group in the molecule forming the component (a).
In the present embodiment, the component (B) preferably contains stearyl (meth) acrylate from the viewpoint of adhesiveness, transparency, level difference filling property and bleeding property, and isostearyl (meth) acrylate is more preferably used from the viewpoint of surface flatness and low dielectric constant. The component (B) preferably further contains a hydroxyl group-containing (meth) acrylate from the viewpoints of adhesiveness, transparency, and reliability under high-temperature and high-humidity conditions. Among the above-mentioned hydroxyl group-containing (meth) acrylates, 4-hydroxybutyl (meth) acrylate is particularly preferred.
(B) The content of the component (b) is preferably 5% by mass or more, more preferably 15% by mass or more, and further preferably 25% by mass or more, based on the total mass of the adhesive resin composition. The content of this component is preferably 65% by mass or less, more preferably 55% by mass, and still more preferably 45% by mass or less, based on the total mass of the adhesive resin composition. (B) When the content of the component (b) is in this range, the viscosity of the adhesive resin composition falls within an appropriate viscosity range for forming an adhesive layer, and the processability becomes better. In addition, the obtained adhesive sheet also has more excellent adhesiveness and transparency. Further, the obtained adhesive layer is more excellent in level difference filling property.
When stearyl (meth) acrylate is used as the component (B), the content of stearyl (meth) acrylate is preferably 5% by mass or more, more preferably 15% by mass or more, and even more preferably 25% by mass or more, based on the total mass of the adhesive resin composition, from the viewpoint that the adhesiveness, transparency, level difference filling property, and surface flatness can be improved in a well-balanced manner. From the same viewpoint, when stearyl (meth) acrylate is used as the component (B), the content thereof is preferably 60% by mass or less, more preferably 50% by mass, and still more preferably 45% by mass or less.
When the hydroxyl group-containing (meth) acrylate is used as the component (B), the content of the hydroxyl group-containing (meth) acrylate is preferably 1 mass% or more, more preferably 2 mass% or more, and further preferably 3 mass% or more with respect to the total mass of the adhesive resin composition, from the viewpoint that the adhesiveness can be further improved and the haze can be further reduced. From the same viewpoint, when a hydroxyl group-containing (meth) acrylate is used as the component (B), the content thereof is preferably 15% by mass or less, more preferably 10% by mass or less, and still more preferably 8% by mass or less.
[ (C) ingredient: (C) crosslinking agent ]
(C) The component (C) is preferably a compound having a (meth) acryloyl group having 2 or more functions, and specific examples of the component (C) include compounds represented by the following formulae (C) to (e), urethane di (meth) acrylate having a urethane bond, a side chain (meth) acrylic acid-modified (meth) acrylate polymer, trimethylolpropane tri (meth) acrylate, tetramethylolmethane tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, and dipentaerythritol hexa (meth) acrylate. Wherein in the formulae (c), (d) and (e), s represents an integer of 1 to 20.
When the compound represented by the formula (c) is used, s is preferably 6 or more, more preferably 9 or more, from the viewpoint of further reducing the haze. From the same viewpoint, when the compound represented by the above formula (c) is used, s is preferably 18 or less. When the compounds represented by the above formulae (d) and (e) are used, s is preferably 1 or more from the viewpoint of further reducing the haze. From the same viewpoint, when the compounds represented by the above formulae (d) and (e) are used, s is preferably 10 or less, more preferably 8 or less.
The urethane di (meth) acrylate having a urethane bond has a weight average molecular weight of 1.0 × 10 synthesized using a polyalkylene glycol having 2 to 4 carbon atoms3The above compounds tend to have poor compatibility with stearyl (meth) acrylate and copolymers containing stearyl (meth) acrylate as a main component.In order to reduce the haze to 1.5% or less, it is preferable that the urethane di (meth) acrylate having a urethane bond synthesized using a polyalkylene glycol having 2 to 4 carbon atoms is substantially not contained or is used in combination with the other component (C) with a reduced content.
The side chain (meth) acrylic acid-modified (meth) acrylate polymer may be a (meth) acrylate polymer in which the side chain is modified with a (meth) acryloyl group, and preferably has a structural unit represented by the following general formula (1) and a structural unit represented by the following general formula (2) from the viewpoint of level difference filling properties and surface flatness, and preferably R in the following general formula (1) from the viewpoint of haze, level difference filling properties, and surface flatness1Is an alkyl group having 9 to 18 carbon atoms. From such a viewpoint, the side chain (meth) acrylic acid-modified (meth) acrylate polymer is more preferably a (meth) acrylate polymer before modification as the component (a). The component (C) is obtained by (meth) acrylic modification of the side chain of the component (a), and the component (a) has more excellent compatibility with the component (C), and therefore, an adhesive sheet having less haze and more excellent surface flatness can be obtained.
As a method for (meth) acrylic modification of the side chain, there is a method of adding a (meth) acrylate having an isocyanate group such as 2-isocyanatoethyl (meth) acrylate represented by the following general formula (4) to the component (a) having a structural unit having a hydroxyl group or a structural unit having a carboxyl group in the main chain of the polymer, for example. In addition, another method includes a method of adding (meth) acrylic acid to a polymer having a glycidyl group-containing structural unit represented by the following general formula (5) in the main chain thereof. Further, there may be mentioned a method of forming a (meth) acrylic acid side chain by graft polymerization using dibutyltin dilaurate or the like, and more preferably a method of adding a (meth) acrylate having an isocyanate group such as 2-isocyanatoethyl (meth) acrylate to a hydroxyl group as shown in the following general formula (3), or a method of adding a (meth) acrylic acid to a glycidyl group as shown in the following general formula (5).
When a (meth) acrylate having an isocyanate group is added to a hydroxyl group represented by the following general formula (3), the addition is preferably performed so that 1 equivalent of the (meth) acrylate having an isocyanate group is 0.01 to 0.9 equivalent with respect to the hydroxyl group. Similarly, when (meth) acrylic acid is added to a glycidyl group represented by the following general formula (5), the addition is preferably performed so that 1 equivalent of (meth) acrylic acid to the glycidyl group is 0.01 equivalent or more and 0.9 equivalent or less.
According to these methods, a structure in which the (meth) acryloyl group in the side chain is bonded to the main chain via a urethane bond or an ester bond can be obtained. Having these structures is preferable from the viewpoint of level difference landfill property.
(wherein R represents hydrogen or methyl, R represents1Represents an alkyl group having 4 to 18 carbon atoms, and X represents-CH2CH2-、-(CH2CH2O)pCH2CH2- { p is an integer of 1 to 500 }, -R2-OCONH-R3-or-R4-CH(OH)CH2-，R2、R3And R4Each independently represents an alkylene group having 1 to 10 carbon atoms. )
R1From the viewpoint of surface flatness and the possibility of further reducing haze, the carbon number is preferably 9 or more, more preferably 12 or more. From the same viewpoint, an alkyl group having 18 or less carbon atoms is preferable. Here, the alkyl group may be a linear alkyl group, a branched alkyl group or an alicyclic alkyl group, and the alkylene group may be a group obtained by removing 1 hydrogen atom from the alkyl group.
(wherein R represents hydrogen or methyl, R represents2Represents an alkylene group having 1 to 10 carbon atoms. )
(wherein R represents hydrogen or methyl, R represents3Represents an alkylene group having 1 to 10 carbon atoms. )
(wherein R represents hydrogen or methyl, R represents4Represents an alkylene group having 1 to 10 carbon atoms. )
When a side chain (meth) acrylic acid-modified (meth) acrylate polymer is used as the component (C), the optimum content of the component (C) varies depending on the modification ratio of the side chain, and if the content is too large, problems such as a decrease in adhesive force, easy peeling, easy mixing of bubbles, and the like tend to occur, whereas if the content is too small, the holding force tends to decrease, and the reliability tends to decrease.
(C) The component (C) is preferably 3.0X 10 from the viewpoint of further suppressing the occurrence of bubbles and peeling under high temperature or high temperature and high humidity2Above, more preferably 5.0 × 102The above. From the same viewpoint, the weight average molecular weight of the component is preferably 1.0 × 105The following.
When a side chain (meth) acrylic acid-modified (meth) acrylate polymer is used as the component (C), the weight average molecular weight is preferably about the same as that of the component (a), but the weight average molecular weight can be used even if it is low because of the side chain modification. Specifically, it is preferably 1.0 × 104More preferably 1.5X 10 or more4Above and inOne step is preferably 2.0X 104More than, particularly preferably 2.5X 104. In addition, it is preferably 3.0 × 105The following, more preferably 1.0X 105Hereinafter, more preferably 8.0 × 104The following, particularly preferably 7.0X 104The following.
(C) The content of the component (b) is preferably 15% by mass or less based on the total mass of the adhesive resin composition. When the content is 15% by mass or less, the crosslinking density does not become too high, and therefore, a pressure-sensitive adhesive layer having more sufficient tackiness, high elasticity, and no brittleness can be obtained. The content of the component (C) is more preferably 10 mass% or less, and still more preferably 7 mass% or less, from the viewpoint of further improving the level difference landfill property.
The lower limit of the content of the component (C) is not particularly limited, but is preferably 0.1% by mass or more, more preferably 1% by mass or more, and further preferably 2% by mass or more, from the viewpoint of further improving the film-forming property.
[ (D) ingredient: (D) photopolymerization initiator
(D) The component (c) is a component that promotes a curing reaction under irradiation of active energy rays. Here, the active energy ray means ultraviolet ray, electron beam, α ray, β ray, γ ray, and the like.
(D) The component (b) is not particularly limited, and known materials such as benzophenone-based, anthraquinone-based, benzoyl-based, sulfonium salt, diazonium salt, and onium salt can be used.
Specific examples thereof include benzophenone, N, N, N ', N' -tetramethyl-4, 4 '-diaminobenzophenone (Meldrum's ketone), N, N-tetraethyl-4, 4 '-diaminobenzophenone, 4-methoxy-4, 4' -dimethylaminobenzophenone, α -hydroxyisobutylbenzophenone, 2-ethylanthraquinone, t-butylanthraquinone, 1, 4-dimethylanthraquinone, 1-chloroanthraquinone, 2, 3-dichloroanthraquinone, 3-chloro-2-methylanthraquinone, 1, 2-benzoanthraquinone, 2-phenylanthraquinone, 1, 4-naphthanthracene, 9, 10-phenanthrenequinone, thioxanthone, 2-chlorothioxanthone, 1-hydroxycyclohexylphenylketone, 2-dimethoxy-1, aromatic ketone compounds such as 2-diphenylethane-1-one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, and 2, 2-diethoxyacetophenone; benzoin compounds such as benzoin, methylbenzoin, and ethylbenzoin; benzoin ether compounds such as benzoin methyl ether, benzoin ethyl ether, benzoin isobutyl ether, and benzoin phenyl ether; benzil compounds such as benzil and benzyldimethyl ketal; ester compounds such as β - (acridin-9-yl) (meth) acrylate; acridine compounds such as 9-phenylacridine, 9-pyridylacridine, and 1, 7-diazacycloheptane; 2- (o-chlorophenyl) -4, 5-diphenylimidazole dimer, 2- (o-chlorophenyl) -4, 5-bis (m-methoxyphenyl) imidazole dimer, 2- (o-fluorophenyl) -4, 5-diphenylimidazole dimer, 2- (o-methoxyphenyl) -4, 5-diphenylimidazole dimer, 2,4, 5-triarylimidazole dimers such as 2- (p-methoxyphenyl) -4, 5-diphenylimidazole dimer, 2, 4-bis (p-methoxyphenyl) 5-phenylimidazole dimer, 2- (2, 4-dimethoxyphenyl) -4, 5-diphenylimidazole dimer, and 2- (p-methylmercaptophenyl) -4, 5-diphenylimidazole dimer; 2-benzyl-2-dimethylamino-1- (4-morpholinylphenyl) -1-butanone; 2-methyl-1- [4- (methylthio) phenyl ] -2-morpholinyl-1-propane; bis (2,4, 6-trimethylbenzoyl) -phenylphosphine oxide; oligo (2-hydroxy-2-methyl-1- (4- (1-methylvinyl) phenyl) propanone), and the like. A plurality of these compounds may be used in combination.
Particularly, α -hydroxyalkylphenone compounds such as 1-hydroxycyclohexylphenylketone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, and 1- [4- (2-hydroxyethoxy) -phenyl ] -2-hydroxy-2-methyl-1-propan-1-one are preferable from the viewpoint of haze reduction; acylphosphine oxide-based compounds such as bis (2,4, 6-trimethylbenzoyl) -phenylphosphine oxide, bis (2, 6-dimethoxybenzoyl) -2,4, 4-trimethyl-pentylphosphine oxide, and 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide; oligo (2-hydroxy-2-methyl-1- (4- (1-methylvinyl) phenyl) propanone).
In particular, for the production of a thick sheet (adhesive layer), the component (D) preferably contains an acylphosphine oxide compound such as bis (2,4, 6-trimethylbenzoyl) -phenylphosphine oxide, bis (2, 6-dimethoxybenzoyl) -2,4, 4-trimethyl-pentylphosphine oxide or 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide.
The content of the component (D) in the present embodiment is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, relative to the total mass of the adhesive resin composition, from the viewpoint of practicality. Further, it is preferably 5% by mass or less, more preferably 3% by mass or less, and further preferably 0.5% by mass or less. When the content of the component (D) is 5% by mass or less, an adhesive layer having high light transmittance, no yellowing in color tone, and further excellent level difference filling properties can be obtained.
[ other additives ]
The adhesive resin composition may further contain various additives different from the above-mentioned components (A), (B), (C) and (D) as required. Examples of the various additives that can be contained include a polymerization inhibitor such as p-methoxyphenol added for the purpose of improving the storage stability of the adhesive resin composition, an antioxidant such as triphenylphosphine added for the purpose of improving the heat resistance of the adhesive layer obtained by photocuring the adhesive resin composition, a Light Stabilizer such as HALS (Hindered Amine Light Stabilizer) added for the purpose of improving the resistance of the adhesive resin composition to Light such as ultraviolet Light, and a silane coupling agent added for the purpose of improving the adhesion of the adhesive resin composition to glass and the like.
In addition, when an adhesive sheet for an image display device is obtained, the adhesive layer is configured to be sandwiched between a base material (heavy release separator 3) of a polymer film such as a polyethylene terephthalate film and a coating film (light release separator 4) made of the same. In this case, in order to control the releasability of the adhesive layer from the substrate and the coating film such as the polyethylene terephthalate film, a surfactant such as a polydimethylsiloxane-based surfactant or a fluorine-based surfactant may be contained in the adhesive resin composition.
These additives may be used alone, or a plurality of additives may be used in combination. The content of these other additives is usually smaller than the total content of the above-mentioned (A), (B), (C) and (D), and is generally about 0.01 to 5% by mass based on the total mass of the adhesive resin composition.
The light transmittance of the pressure-sensitive adhesive layer to light in the visible light region (wavelength: 380 to 780nm) is preferably 80% or more, more preferably 90% or more, and still more preferably 95% or more.
As the heavy-duty separator 3, for example, a polymer film such as polyethylene terephthalate, polypropylene, polyethylene, or polyester is preferable, and among them, a polyethylene terephthalate film (hereinafter, also referred to as a "PET film") is more preferable. The thickness of the heavy-duty separator 3 is preferably 50 μm or more, more preferably 60 μm or more, and still more preferably 70 μm or more, from the viewpoint of workability. From the same viewpoint, the thickness of the heavy-duty separator 3 is preferably 2.0 × 102μ m or less, more preferably 1.5X 102μ m or less, more preferably 1.3X 102And is less than μm. The planar shape of the heavy peeling membrane 3 is preferably larger than the planar shape of the adhesive layer 2, and the outer edge of the heavy peeling membrane 3 protrudes further to the outside than the outer edge of the adhesive layer 2. The projecting amount of the outer edge of the heavy-release separator 3 projecting outward beyond the outer edge of the adhesive layer 2 is preferably 2mm or more, more preferably 4mm or more, from the viewpoint of ease of handling, ease of peeling, and further reduction in the adhesion of dust and the like. From the same viewpoint, the projecting amount of the outer edge of the heavy-duty separator 3 projecting outward beyond the outer edge of the adhesive layer 2 is preferably 20mm or less, and more preferably 10mm or less. When the planar shape of the adhesive layer 2 and the heavy release separator 3 is a substantially rectangular shape such as a substantially rectangular shape, the amount of protrusion of the outer edge of the heavy release separator 3 to the outside of the outer edge of the adhesive layer 2 is preferably 2mm or more in at least one side, more preferably 4mm or more in at least one side, further preferably 2mm or more in all sides, and particularly preferably 4mm or more in all sides, from the viewpoint described above. From the same viewpoint, it is preferably 20mm or less in at least one side, more preferably 10mm or less in at least one side, further preferably 20mm or less in all sides, and particularly preferably 10mm or less in all sides.
As light release barriersThe film 4 is preferably a polymer film such as polyethylene terephthalate, polypropylene, polyethylene, or polyester, and more preferably a polyethylene terephthalate film. The thickness of the light peeling separator 4 is preferably 25 μm or more, more preferably 30 μm or more, and further preferably 40 μm or more from the viewpoint of workability. From the same viewpoint, the thickness of the light peeling separator 4 is preferably 1.5 × 102μ m or less, more preferably 1.0X 102And is preferably 75 μm or less. The planar shape of the light peeling membrane 4 is preferably larger than the planar shape of the adhesive layer 2, and the outer edge of the light peeling membrane 4 protrudes further to the outside than the outer edge of the adhesive layer 2. The projecting amount of the outer edge of the light release separator 4 projecting further outward than the outer edge of the adhesive layer 2 is preferably 2mm or more, more preferably 4mm or more, from the viewpoints of ease of handling, ease of peeling, and further reduction in the adhesion of dust and the like. From the same viewpoint, the projecting amount of the outer edge of the light peeling separator 4 projecting further to the outside than the outer edge of the adhesive layer 2 is preferably 20mm or less, more preferably 10mm or less. In the case where the planar shape of the adhesive layer 2 and the light-peeling separator 4 is a substantially rectangular shape such as a substantially rectangular shape, from the above-described viewpoint, the amount of protrusion of the outer edge of the light-peeling separator 4 to the outside of the outer edge of the adhesive layer 2 is preferably 2mm or more in at least one side, more preferably 4mm or more in at least one side, further preferably 2mm or more in all sides, and particularly preferably 4mm or more in all sides. From the same viewpoint, it is preferably 20mm or less in at least one side, more preferably 10mm or less in at least one side, further preferably 20mm or less in all sides, and particularly preferably 10mm or less in all sides.
The peel strength between the light peeling separator 4 and the adhesive layer 2 is preferably lower than the peel strength between the specific gravity peeling separator 3 and the adhesive layer 2. Thus, the heavy release separator 3 is more difficult to be released from the adhesive layer 2 than the light release separator 4. As described later, the blade B is led to the adhesive layer 2 toward the heavy peeling separator 3 side, and therefore the outer edge portion of the adhesive layer 2 is pressed against the heavy peeling separator 3. Thus, the heavy release separator 3 is more difficult to be peeled from the adhesive layer 2 than the light release separator 4, and the light release separator 4 can be peeled before the heavy release separator 3 is peeled. Therefore, the separators 3 and 4 can be peeled off one side, and the operation of peeling the separators 3 and 4 and then attaching the adhesive layer 2 to the respective objects to be adhered can be reliably performed one side. The peel strength between the heavy-duty separator 3 and the adhesive layer 2 and between the light-duty separator 4 and the adhesive layer 2 can be adjusted by, for example, performing surface treatment of the heavy-duty separator 3 and the light-duty separator 4. Examples of the surface treatment method include a mold release treatment using a silicone compound or a fluorine compound.
< method for producing adhesive sheet for image display device I >
The adhesive sheet 1 (3-layer product) described above was produced as follows. First, as shown in fig. 3, a base material film 10 is prepared in which an adhesive layer 2 is formed on a heavy-peeling separator 3 and a temporary separator 6 is formed on the adhesive layer 2. The temporary membrane 6 is, for example, a layer composed of the same material as the light peeling membrane 4.
Next, as shown in fig. 4, the temporary diaphragm 6 and the adhesive layer 2 are cut into a desired shape by a punching device (not shown) provided with a blade B. The punching device may be a crank type punching device, a reciprocating type punching device, or a rotary type punching device. In addition, the shearing may be performed by using a laser cutter. From the viewpoint of peelability of each base material, a rotary punching device is preferable. In this step, it is preferable to cut the temporary separator 6 and the adhesive layer 2 by passing the blade B into the temporary separator 6 and the adhesive layer 2 to a depth at which the separator 3 is peeled off again. This forms the cut portion 3c in the heavy peeling separator 3, and the heavy peeling separator 3 is easily peeled from the adhesive layer 2.
Next, the outer portions of the temporary separator 6 and the adhesive layer 2 are removed as shown in fig. 5, the temporary separator 6 is peeled off from the adhesive layer 2 as shown in fig. 6, and the light-peeling separator 4 is stuck to the adhesive layer 2 as shown in fig. 7. The adhesive sheet 1 (3-layer product) was completed by the above steps.
< image display device >
Next, an image display device manufactured using the adhesive sheet 1 will be described. The adhesive layer 2 of the adhesive sheet 1 can be applied to various image display devices. Examples of the image display device include a Plasma Display Panel (PDP), a Liquid Crystal Display (LCD), a Cathode Ray Tube (CRT), a Field Emission Display (FED), an organic EL display (OELD), a 3D display, and Electronic Paper (EP). The adhesive layer 2 of the present embodiment may be used for bonding a functional layer such as an antireflection layer, an antifouling layer, a dye layer, and a hard coat layer, a transparent protective plate, and the like of an image display device in combination.
The antireflection layer may be any layer having an antireflection property such that the visible light reflectance is 5% or less, and a layer treated by a known antireflection method on a transparent substrate such as a transparent plastic film may be used.
The antifouling layer is a layer for making the surface less likely to be stained, and a known layer formed using a fluorine-based resin, a silicone-based resin, or the like for reducing the surface tension can be used.
The dye layer is used for improving color purity, and is used for reducing unnecessary light when color purity of light emitted from an image display unit such as a liquid crystal display unit is low. The dye is obtained by dissolving a dye that absorbs light in an unnecessary part in a resin, and forming or laminating the dye on a base film such as a polyethylene film or a polyester film.
The hard coat layer is used to increase the surface hardness. As the hard coat layer, for example, a layer obtained by forming or laminating an acrylic resin such as urethane acrylate or epoxy acrylate, an epoxy resin, or the like on a base film such as a polyethylene film can be used. Similarly, in order to increase the surface hardness, a layer in which a hard coat layer is formed or laminated on a transparent protective plate such as glass, acrylic resin, polycarbonate, or the like may be used.
The adhesive layer 2 may be laminated on a polarizing plate. In this case, the polarizing plate may be laminated on the visible surface side of the polarizing plate or may be laminated on the opposite side.
When the polarizing plate is used on the visible surface side, an antireflection layer, an antifouling layer, and a hard coat layer may be laminated on the visible surface side of the adhesive layer 2, and when the polarizing plate is used between the polarizing plate and the liquid crystal cell, a layer having functionality may be laminated on the visible surface side of the polarizing plate.
In the case of producing such a laminate, the adhesive layer 2 can be laminated by using a roll laminator, a vacuum laminator, or a sheet laminator.
The adhesive layer 2 is preferably disposed at an appropriate position on the visible side between the image display unit of the image display device and the transparent protective plate at the forefront on the visible side. In particular, it is preferably applied between the image display unit and the transparent protective plate.
In the image display device in which the image display unit is combined with the touch panel, the adhesive layer 2 according to the present embodiment is preferably applied between the touch panel and the image display unit and/or between the touch panel and the transparent protective plate, but the adhesive layer 2 according to the present embodiment is not limited to the above-described positions if it can be applied to the configuration of the image display device.
Hereinafter, a liquid crystal display device, which is one of the image display devices, will be described in detail with reference to fig. 8 and 9 as an example.
Fig. 8 is a side cross-sectional view schematically showing an embodiment of a liquid crystal display device according to the present invention. The liquid crystal display device shown in fig. 8 includes an image display unit 7 in which a backlight system 50, a polarizing plate 22, a liquid crystal display unit 12, and a polarizing plate 20 are laminated in this order; a transparent resin layer 32 provided on the upper surface of the polarizing plate 20 which becomes the visible side of the liquid crystal display device; and a transparent protection plate (protection panel) 40 provided on the surface thereof. The step 60 provided on the surface of the transparent protective plate 40 is filled with the transparent resin layer 32. The transparent resin layer 32 basically corresponds to the adhesive layer of the present embodiment. The thickness of the step 60 varies depending on the size of the liquid crystal display device, and is 40 μm to 1.0X 102When the thickness is μm, the adhesive layer of the present embodiment is particularly useful.
Fig. 9 is a side cross-sectional view schematically showing a liquid crystal display device mounted with a touch panel as one embodiment of the liquid crystal display device of the present invention. The liquid crystal display device shown in fig. 9 includes an image display unit 7 in which a backlight system 50, a polarizing plate 22, a liquid crystal display unit 12, and a polarizing plate 20 are laminated in this order; a transparent resin layer 32 provided on the upper surface of the polarizing plate 20 which becomes the visible side of the liquid crystal display device; a touch panel 30 disposed on an upper surface of the transparent resin layer 32; a transparent resin layer 31 disposed on an upper surface of the touch panel 30; and a transparent protective plate 40 provided on the surface thereof. The step 60 provided on the surface of the transparent protective plate 40 is filled with the transparent resin layer 31. The transparent resin layer 31 and the transparent resin layer 32 basically correspond to the adhesive layer of the present embodiment.
In the liquid crystal display device of fig. 9, the transparent resin layers are present between the image display unit 7 and the touch panel 30 and between the touch panel 30 and the transparent protective plate 40 having the step 60, but the transparent resin layer may be present only in at least one of these layers, and particularly when the adhesive layer 2 of the present embodiment is used, the transparent resin layer is preferably interposed between the touch panel 30 and the transparent protective plate 40 having the step 60. In addition, when the touch panel is of an On-Cell type, the touch panel and the liquid crystal display unit are integrated. As a specific example thereof, a device in which the liquid crystal display unit 12 of the liquid crystal display device of fig. 8 is replaced with an On-Cell may be mentioned.
In recent years, liquid crystal display cells incorporating a touch panel function, which are called In-Cell type touch panels, have been developed. The liquid crystal display device including such a liquid crystal display Cell is composed of a transparent protective plate, a polarizing plate, and a liquid crystal display Cell (a liquid crystal display Cell with a touch panel function), and the adhesive layer 2 according to the present embodiment of the present invention can also be preferably used for a liquid crystal display device using such an In-Cell type touch panel.
According to the liquid crystal display device shown in fig. 8 and 9, since the adhesive layer of the present embodiment is provided as the transparent resin layer 31 or 32, an image having impact resistance, no ghost, sharpness, and high contrast can be obtained.
The liquid crystal display unit 12 may use a unit made of a liquid crystal material known in the art. The liquid crystal material control method is classified into a TN (Twisted Nematic) method, an STN (Super-Twisted Nematic) method, a VA (vertical alignment) method, an IPS (In-plane-Switching) method, and the like, and any control method may be used In the present invention.
As the polarizing plates 20 and 22, a polarizing plate which is usual in the art can be used. The surfaces of these polarizing plates may be subjected to treatment such as antireflection, stain-proofing, and hard coating. Such surface treatment may be performed on one side of the polarizer or both sides thereof.
The touch panel 30 includes a resistive film type in which electrodes are brought into contact by pressure of a finger or an object touching a surface, a capacitance type in which a change in capacitance when a finger or an object touches a surface is sensed, an electromagnetic induction type, and the like, and the adhesive layer 2 of the present invention is particularly suitable for a liquid crystal display device using a touch panel of the capacitance type. As the touch panel 30, a panel generally used in the art can be used, and as the touch panel of the capacitance type, for example, a panel having a structure in which a transparent electrode is formed on a substrate can be used. Examples of the substrate include a glass substrate, a polyethylene terephthalate film, and a cycloolefin polymer film. The transparent electrode may be, for example, a metal oxide such as ITO (indium tin oxide). The thickness of the substrate is 20 μm to 1.0X 103About μm. The thickness of the transparent electrode is 10nm to 5.0X 102About nm.
The transparent resin layer 31 or 32 may be formed to have a thickness of about 0.02 to 3mm, for example. In particular, the adhesive layer 2 of the present embodiment can exhibit more excellent effects by being formed into a thick film, and can be formed into a thickness of 1.0 × 102Mum or moreAnd 5.0X 102The transparent resin layer 31 or 32 having a thickness of μm or less can be preferably used.
As the transparent protective plate 40, a general optical transparent substrate can be used. Specific examples thereof include inorganic plates such as glass substrates and quartz plates; plastic substrates such as acrylic resin substrates, polycarbonate substrates, cycloolefin polymer substrates, and the like; and resin sheets such as thick polyester sheets. When high surface hardness is required, a glass substrate or an acrylic resin substrate is preferable, and a glass substrate is more preferable. The surface of these transparent protective plates may be subjected to treatment such as antireflection, stain resistance, hard coating, or the like. Such surface treatment may be performed on one side or both sides of the transparent protective plate. The transparent protection plate can also be combined to use a plurality of plates.
The backlight system 50 is typically constituted by a reflecting means such as a reflector and an illuminating means such as a lamp.
< method for manufacturing image display device I >
The adhesive sheet 1 (3-layer product) is used as follows in assembling an image display device or the like. First, as shown in fig. 10, the light release separator 4 is peeled off from the adhesive sheet 1 (3-layer product) to expose the adhesive surface 2b of the adhesive layer 2. Next, as shown in fig. 11, the adhesive surface 2b of the adhesive layer 2 is stuck to the adherend a1 and pressed by a roller R or the like. At this time, the step 60 provided on the surface of the object to be adhered a1 is filled with the adhesive layer 2. The adherend a1 is, for example, an image display unit, a transparent protective plate, or a touch panel. Next, as shown in fig. 12, the heavy-duty separator 3 is peeled off from the adhesive layer 2 to expose the adhesive surface 2c of the adhesive layer 2. Next, as shown in fig. 13, the adhesive surface 2c of the adhesive layer 2 is stuck to the adherend a2, and heat and pressure treatment (autoclave treatment) is performed. The adherend a2 is, for example, an image display unit, a transparent protective plate, or a touch panel. In this way, the objects to be adhered can be bonded to each other via the adhesive layer 2. The heat and pressure treatment conditions are such that the temperature is 40 ℃ to 80 ℃ inclusive, the pressure is 0.3MPa to 0.8MPa inclusive, and the difference in height between the surfaces of the objects to be adhered is 30 μm to 1.0X 102At μm, the height can be further removedFrom the viewpoint of near-bubble generation, the temperature is preferably 50 ℃ to 70 ℃ and the pressure is preferably 0.4MPa to 0.7 MPa. From the above viewpoint, the treatment time is preferably 5 minutes or more, and more preferably 10 minutes or more. From the same viewpoint, it is preferably 60 minutes or less, and more preferably 50 minutes or less.
The above-mentioned production method preferably includes a step of irradiating the adhesive layer 2 with ultraviolet light from one side of either of the two objects to be adhered (e.g., transparent protective plate, touch panel) before or after the autoclave treatment. This can further improve the reliability (reduction of generation of bubbles and suppression of peeling) and the adhesive force under high temperature and high humidity. From the viewpoint of further improving the reliability under high temperature and high humidity, it is preferable to irradiate the adherend (for example, touch panel) side without the step portion with ultraviolet rays.
The dose of ultraviolet radiation is not particularly limited, but is preferably 5.0X 102mJ/cm2～5.0×103mJ/cm2Left and right. In addition, the step of irradiating with ultraviolet rays is preferably performed after autoclave treatment from the viewpoint of improving reliability under high temperature and high humidity. In the structure thus obtained, when a glass substrate (soda-lime glass) or an acrylic resin substrate is used as the adherend, the peel strength between the adhesive layer 2 and these substrates is preferably 5N/10mm or more, more preferably 8N/10mm or more, and even more preferably 10N/10mm or more, from the viewpoint of suppressing peeling of the adhesive layer in the image display device. From the viewpoint of practicality, the peel strength between the adhesive layer 2 and the substrate is preferably 30N/10mm or less. The peel strength can be measured by 180-degree peeling (peeling speed 300 mm/min for 3 seconds, measurement temperature 25 ℃) using a tensile tester ("TENSILON RTC-1210" manufactured by Orientec corporation).
Through the above steps, the adhesive layer 2 is disposed between the adherend a1 and the adherend a 2. The adhesive layer 2 is particularly preferably disposed between the transparent protective plate and the touch panel or between the touch panel and the image display unit.
The liquid crystal display device of fig. 8 can be manufactured by interposing the adhesive layer 2 of the present embodiment between the image display unit 7 and the transparent protective plate 40 to obtain a laminate. That is, in the image display device shown in fig. 8, the adhesive layer 2 of the present embodiment can be laminated on the upper surface of the polarizing plate 20 by a lamination method.
The liquid crystal display device of fig. 9 can be manufactured by interposing the adhesive layer 2 of the present embodiment between the image display unit and the touch panel or between the touch panel and the transparent protective plate to obtain a laminate.
[ second embodiment ]
< adhesive sheet for image display device II >
The adhesive sheet 1 (4-layer product) for an image display device of the present embodiment includes a film-shaped adhesive layer, 1 st and 2 nd base material layers laminated so as to sandwich the adhesive layer, and a carrier layer further laminated on the 2 nd base material layer, and outer edges of the 1 st base material layer and the carrier layer protrude outward from outer edges of the adhesive layer.
That is, as shown in fig. 14 and 15, the adhesive sheet 1 (4-layer product) of the present embodiment includes a transparent film-like adhesive layer 2, a light-peeling separator 4 (1 st base material layer) and a heavy-peeling separator 3 (2 nd base material layer) laminated so as to sandwich the adhesive layer 2, and a carrier film 5 (carrier layer) further laminated on the heavy-peeling separator 3.
The outer edge 5a of the carrier film 5 projects further to the outside than the outer edge 2a of the adhesive layer 2. Thus, the carrier film 5 can be easily peeled from the 2 nd base material layer by grasping the outer edge portion of the carrier film 5 projecting outward. In addition, the outer edge 5a of the carrier film 5 preferably protrudes further to the outside than the outer edge 4a of the light peeling separator 4. This makes it easier to grasp the outer edge portion of the carrier film 5, and thus the carrier film 5 can be peeled off more easily. The projecting amount of the outer edge 5a of the carrier film 5 projecting outward beyond the outer edge 4a of the light peeling separator 4 is preferably 0.5mm or more, more preferably 1mm or more, from the viewpoint of ease of handling, ease of peeling, and further reduction in adhesion of dust and the like. From the same viewpoint, the projecting amount of the outer edge 5a of the carrier film 5 projecting outward beyond the outer edge 4a of the light peeling separator 4 is preferably 10mm or less, and more preferably 5mm or less. When the planar shape of the carrier film 5, the adhesive layer 2, the heavy-release separator 3, and the light-release separator 4 is substantially rectangular such as substantially rectangular, from the above-described viewpoint, the amount of protrusion of the outer edge 5a of the carrier film 5 to the outside of the outer edge 4a of the light-release separator 4 is preferably 0.5mm or more in at least 1 side, more preferably 1mm or more in at least 1 side, further preferably 0.5mm or more in all sides, and particularly preferably 1mm or more in all sides. From the same viewpoint, the projecting amount of the outer edge 5a of the carrier film 5 projecting further to the outside than the outer edge 4a of the light peeling separator 4 is preferably 10mm or less in at least one side, more preferably 5mm or less in at least one side, further preferably 10mm or less in all sides, and particularly preferably 5mm or less in all sides.
Since the heavy peeling separator 3 is protected by the carrier film 5 until the previous step, the surface of the heavy peeling separator 3 is less scratched. This makes it possible to easily see the scratches on the adhesive layer 2 and to easily remove the scratches before the adhesive layer 2 is attached to the adherend.
The carrier film 5 is, for example, a polymer film such as polyethylene terephthalate, polypropylene, polyethylene, or polyester, and among them, a polyethylene terephthalate film is preferable. The thickness of the carrier film 5 is preferably 15 μm or more, and more preferably 20 μm or more, from the viewpoint of workability. From the same viewpoint, the thickness of the carrier film 5 is preferably 100 μm or less, more preferably 80 μm or less, and still more preferably 50 μm or less.
The peel strength between the light peeling film 4 and the adhesive layer 2 is lower than the peel strength between the heavy peeling film 3 and the adhesive layer 2. The peel strength between the carrier film 5 and the heavy peeling separator 3 is lower than the peel strength between the heavy peeling separator 3 and the adhesive layer 2. Here, the peel strength between the carrier film 5 and the heavy-duty release separator 3 is more preferably lower than the peel strength between the light-duty release separator 4 and the adhesive layer 2, but even if it is high, the effects of the present invention are not impaired.
The peel strength of the carrier film 5 and the heavy release separator 3 is adjusted by, for example, the type of the adhesive layer formed between the carrier film 5 and the heavy release separator 3 and the thickness of the adhesive. Examples of the adhesive formed between the carrier film 5 and the heavy-duty separator 3 include acrylic adhesives. The thickness of the adhesive layer formed between the carrier film 5 and the heavy release separator 3 is preferably 0.1 μm or more. Further, it is preferably 10 μm or less, more preferably 5 μm or less.
As described above, according to the adhesive sheet 1 (4-layer product) of the present embodiment, the separators 3 and 4 and the carrier film 5 can be peeled off reliably and easily in a predetermined order without peeling failure while protecting the adhesive layer 2.
< method for producing adhesive sheet for image display device II >
The adhesive sheet 1 (4-layer product) of the present embodiment was produced as follows. First, as shown in fig. 16, a base material film 10 in which a heavy-release separator 3, an adhesive layer 2, and a temporary separator 6 are sequentially laminated on a carrier film 5 is prepared. The heavy-release separator 3 is bonded to the carrier film 5 via the adhesive layer. The temporary membrane 6 is, for example, a layer composed of the same material as the light peeling membrane 4.
Next, the temporary separator 6, the adhesive layer 2, and the heavy peeling separator 3 are cut into a desired shape by a punching device (not shown) provided with a blade B. In this step, as shown in fig. 17, it is preferable that the blade B is passed through the temporary separator 6, the adhesive layer 2, and the re-peeling separator 3 to a depth reaching the carrier film 5. This forms a notch 5c in the surface 5b of the carrier film 5 on the side of the adhesive layer 2. In this way, the blade B is moved from the temporary separator 6 to the carrier film 5, whereby the adhesive layer 2 and the heavy release separator 3 can be completely cut.
Next, as shown in fig. 18, the outer portions of the temporary separator 6, the adhesive layer 2, and the heavy peeling separator 3 are removed. In this case, it is preferable that the outer edge of the heavy release separator 3 and the outer edge of the carrier film 5 are substantially flush with each other as shown in fig. 19 so that the outer edge of the carrier film 5 does not protrude outward beyond the outer edge of the heavy release separator 3. That is, the following states are preferable: only the outer portions of the temporary separator 6 and the adhesive layer 2 were removed, and the outer portion of the heavy release separator 3 was not removed and remained on the carrier film 5, and the heavy release separator 3 after cutting was attached to the carrier film 5 as it was. This can effectively prevent the carrier film 5 having an exposed surface from being bonded to another portion.
After the outer portions of the temporary separator 6, the adhesive layer 2, and the heavy release separator 3 are removed as shown in fig. 18, the temporary separator 6 is then peeled off from the adhesive layer 2 as shown in fig. 20, and the light release separator 4 is attached to the adhesive layer 2 as shown in fig. 21. The adhesive sheet 1 (4-layer product) of the present embodiment is completed by the above steps. As described above, if the film is cut so that the outer edge of the heavy peeling separator 3 and the outer edge of the adhesive layer 2 are substantially flush with each other, the difference in the ease of peeling between the light peeling separator 4 and the heavy peeling separator 3 becomes more significant, and therefore the light peeling separator 4 can be peeled off more easily before the heavy peeling separator 3 is peeled off. Further, since the outer edge of the heavy peeling membrane 3 coincides with the outer edge of the adhesive layer 2, the position of the outer edge of the adhesive layer 2 becomes clear, and therefore, the position alignment of the adhesive layer 2 and the adherend becomes easy.
< method for manufacturing image display device II >
The adhesive sheet 1 (4-layer product) of the present embodiment can be used in the same manner as the adhesive sheet of the first embodiment except that the carrier film 5 is peeled from the heavy-peeling separator 3 and then used as shown in fig. 22.
While the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention.
Examples
The present invention will be described in more detail with reference to the following examples. In the present example, the adhesive sheets of the first and second embodiments were produced, but the present invention is not limited to these examples.
Synthesis example 1 (Synthesis of acrylic acid derivative Polymer (A-1))
In a reaction vessel equipped with a cooling tube, a thermometer, a stirring device, a dropping funnel and a nitrogen inlet tube, 96.0g of isostearyl acrylate (product name "ISTA" from Osaka organic chemical Co., Ltd.), 24.0g of 2-hydroxyethyl acrylate (product name "HEA" from Osaka organic chemical Co., Ltd.) and 150.0g of methyl ethyl ketone were taken as initial monomers, and heated from room temperature (25 ℃ C.) to 80 ℃ C within 15 minutes while replacing nitrogen with an air flow rate of 100 mL/minute. Then, while maintaining the temperature at 80 ℃, a solution prepared by dissolving 5.0g of t-butylperoxy-2-ethylhexanoate in 24.0g of isostearyl acrylate and 6.0g of 2-hydroxyethyl acrylate as additional monomers was prepared, and this solution was added dropwise over 120 minutes. After the completion of the dropwise addition, the reaction was continued for 2 hours.
Then, methyl ethyl ketone was distilled off to obtain a copolymer of isostearyl acrylate and 2-hydroxyethyl acrylate (weight average molecular weight: 3.0X 10)4)。
Synthesis example 2 (Synthesis of acrylic acid derivative Polymer (A-2))
In a reaction vessel equipped with a cooling tube, a thermometer, a stirrer, a dropping funnel and a nitrogen inlet tube, 108.0g of isostearyl acrylate, 12.0g of 2-hydroxyethyl acrylate and 150.0g of methyl ethyl ketone as initial monomers were charged, and heated from room temperature (25 ℃) to 80 ℃ over 15 minutes while replacing nitrogen with an air volume of 100 mL/minute. Then, while maintaining the temperature at 80 ℃, a solution prepared by dissolving 5.0g of t-butylperoxy-2-ethylhexanoate in 27.0g of isostearyl acrylate and 3.0g of 2-hydroxyethyl acrylate as additional monomers was prepared, and this solution was added dropwise over 120 minutes. After the completion of the dropwise addition, the reaction was continued for 2 hours.
Then, methyl ethyl ketone was distilled off to obtain a copolymer of isostearyl acrylate and 2-hydroxyethyl acrylate (weight average molecular weight: 3.0X 10)4)。
Synthesis example 3 (Synthesis of acrylic acid derivative Polymer (A-3))
96.0g of 2-ethylhexyl acrylate, 24.0g of 2-hydroxyethyl acrylate, and 150.0g of methyl ethyl ketone as initial monomers were charged in a reaction vessel equipped with a cooling tube, a thermometer, a stirrer, a dropping funnel, and a nitrogen introduction tube, and heated from room temperature (25 ℃) to 80 ℃ over 15 minutes while replacing nitrogen with an air flow of 100 mL/minute. Then, while maintaining the temperature at 80 ℃, a solution in which 5.0g of t-butylperoxy-2-ethylhexanoate was dissolved was prepared using 24.0g of 2-ethylhexyl acrylate and 6.0g of 2-hydroxyethyl acrylate as additional monomers, and this solution was added dropwise over 120 minutes. After the completion of the dropwise addition, the reaction was continued for 2 hours.
Subsequently, a copolymer of 2-ethylhexyl acrylate and 2-hydroxyethyl acrylate (weight average molecular weight 3.0X 10) was obtained by distilling off methyl ethyl ketone4)。
Synthesis example 4 (Synthesis of side chain methacrylic acid-modified acrylate Polymer (C-1))
100.0g of the acrylic acid derivative polymer (A-1) of Synthesis example 1, 2.0g of 2-isocyanatoethyl methacrylate, 0.05g of p-methoxyphenol as a polymerization inhibitor, and 0.03g of dibutyltin dilaurate as a catalyst were taken in a reaction vessel equipped with a cooling tube, a thermometer, a stirring device, a dropping funnel, and an oxygen introduction tube, and heated from room temperature (25 ℃ C.) to 75 ℃ for 15 minutes while passing air at a flow rate of 100 mL/minute. Then, the reaction was continued for 2 hours while maintaining the temperature at 75 ℃ and then IR measurement was carried out, whereby disappearance of the isocyanate group was confirmed. The reaction was terminated at this point, and a side chain methacrylic acid-modified acrylate polymer having a polymerizable unsaturated bond (weight average molecular weight: 3.0X 10) was obtained4)。
In addition, a Fourier transform infrared spectrophotometer (FT-710) manufactured by horiba, Ltd was used for the IR measurement.
Synthesis example 5 (Synthesis of side chain methacrylic acid-modified acrylate Polymer (C-2))
100.0g of the acrylic acid derivative polymer (A-2) of Synthesis example 2, 2.0g of 2-isocyanatoethyl methacrylate, 0.05g of p-methoxyphenol as a polymerization inhibitor, and 0.03g of dibutyltin dilaurate as a catalyst were taken in a reaction vessel equipped with a cooling tube, a thermometer, a stirring device, a dropping funnel, and an air introduction tube, and heated from room temperature (25 ℃ C.) to 75 ℃ for 15 minutes while passing air at a flow rate of 100 mL/minute. Then, the reaction was continued for 2 hours while maintaining the temperature at 75 ℃ and then IR measurement was carried out, whereby disappearance of the isocyanate group was confirmed. The reaction was terminated at this point, and a side chain methacrylic acid-modified acrylate polymer having a polymerizable unsaturated bond (weight average molecular weight: 3.0X 10) was obtained4)。
Synthesis example 6 (Synthesis of side chain methacrylic acid-modified acrylate Polymer (C-3))
100.0g of the acrylic acid derivative polymer (A-3) of Synthesis example 3, 2.0g of 2-isocyanatoethyl methacrylate, 0.05g of p-methoxyphenol as a polymerization inhibitor, and 0.03g of dibutyltin dilaurate as a catalyst were taken in a reaction vessel equipped with a cooling tube, a thermometer, a stirring device, a dropping funnel, and an air introduction tube, and heated from room temperature (25 ℃ C.) to 75 ℃ for 15 minutes while passing air at a flow rate of 100 mL/minute. Then, the reaction was continued for 2 hours while maintaining the temperature at 75 ℃ and then IR measurement was carried out, whereby disappearance of the isocyanate group was confirmed. The reaction was terminated at this point, and a side chain methacrylic acid-modified acrylate polymer having a polymerizable unsaturated bond (weight average molecular weight: 3.0X 10) was obtained4)。
Synthesis example 7 (Synthesis of side chain methacrylic acid-modified acrylate Polymer (C-4))
In a reaction vessel equipped with a cooling tube, a thermometer, a stirrer, a dropping funnel and a nitrogen inlet tube, 96.0g of lauryl acrylate (alkyl acrylate having 12 carbon atoms in the alkyl group), 24.0g of 2-hydroxyethyl acrylate and 150.0g of methyl ethyl ketone were taken as initial monomers, and the mixture was heated from room temperature (25 ℃) to 80 ℃ within 15 minutes while replacing the nitrogen with an air volume of 100 mL/minute. Then, while maintaining the temperature at 80 ℃, a solution prepared by dissolving 5.0g of t-butylperoxy-2-ethylhexanoate in 24.0g of lauryl acrylate and 6.0g of 2-hydroxyethyl acrylate as additional monomers was prepared, and this solution was added dropwise over 120 minutes. After the completion of the dropwise addition, the reaction was continued for 2 hours.
Then, a copolymer of lauryl acrylate and 2-hydroxyethyl acrylate (weight average molecular weight 3.0X 10) was obtained by distilling off methyl ethyl ketone4)。
Subsequently, the obtained copolymer, 2.0g of 2-isocyanatoethyl methacrylate, 0.05g of p-methoxyphenol as a polymerization inhibitor, and 0.03g of dibutyltin dilaurate as a catalyst were taken out from a reaction vessel equipped with a cooling tube, a thermometer, a stirring device, a dropping funnel, and an air introduction tube, and heated from room temperature (25 ℃) to 75 ℃ for 15 minutes while passing air at a flow rate of 100 mL/minute. Then, the reaction was continued for 2 hours while maintaining the temperature at 75 ℃ and then IR measurement was carried out, whereby disappearance of the isocyanate group was confirmed. The reaction was terminated at this point, and a side chain methacrylic acid-modified acrylate polymer having a polymerizable unsaturated bond (weight average molecular weight: 3.0X 10) was obtained4)。
Synthesis example 8 (Synthesis of urethane diacrylate (C-5))
In a reaction vessel equipped with a cooling tube, a thermometer, a stirring device, a dropping funnel and an air inlet tube, polypropylene glycol (number average molecular weight: 2.0X 10)3)285.3g, 24.5g of unsaturated fatty acid hydroxyalkyl ester-modified caprolactone (product of Daicel chemical Co., Ltd., product name "Placcel FA 2D"), 0.13g of p-methoxyphenol as a polymerization inhibitor, and bis (meth) acrylate as a catalyst0.5g of dibutyltin laurate was heated from room temperature (25 ℃ C.) to 75 ℃ over 15 minutes while passing air at an air flow rate of 100 mL/minute. Then, while maintaining the temperature at 75 ℃, 39.6g of isophorone diisocyanate was uniformly added dropwise over 2 hours to carry out a reaction.
After the completion of the dropwise addition, the reaction was carried out for 6 hours. Disappearance of the isocyanate group was confirmed by IR measurement, and the reaction was terminated to obtain a urethane acrylate (weight average molecular weight: 3.0X 10) having polypropylene glycol and isophorone diisocyanate as constituent units and having (meth) acryloyl groups at both ends4)。
The weight average molecular weight is a value determined by measuring with gel permeation chromatography using Tetrahydrofuran (THF) as a solvent, and converting with a standard curve of standard polystyrene using the following apparatus and measurement conditions. In the preparation of the calibration curve, 5 sample groups (PStQuick MP-H, PStQuick B [ trade name, manufactured by Tosoh corporation ]) were used as standard polystyrenes.
The device comprises the following steps: high-speed GPC apparatus HCL-8320GPC (Detector: differential refractometer) (product name of Tosoh corporation)
The use of a solvent: tetrahydrofuran (THF)
A chromatographic column: column TSKGEL SuperMultipore HZ-H (product of Tosoh corporation, trade name)
Size of chromatographic column: the length of the chromatographic column is 15cm, and the inner diameter of the chromatographic column is 4.6mm
Measuring temperature: 40 deg.C
Flow rate: 0.35 mL/min
Sample concentration: 10mg/THF5ml
Injection amount: 20 μ l
The following components were prepared as raw materials of the adhesive resin composition.
Component A: acrylic acid derivative polymers (A-1) to (A-3)
And B component: isostearyl acrylate (product of Osaka organic chemical industry Co., Ltd., trade name "ISTA")
: n-stearyl acrylate (available from Osaka organic chemical industry Co., Ltd., trade name "STA")
: 2-ethylhexyl acrylate (2EHA)
: acrylic acid 4-hydroxybutyl ester (4HBA)
And C, component C: side chain methacrylic acid modified acrylate polymers (C-1) - (C-4)
: polyurethane diacrylate (C-5)
: 1, 9-nonanediol diacrylate (C-6, a product of Kyoeisha chemical Co., Ltd.)
And (D) component: 1-Hydroxycyclohexylphenylketone (I-184, product of BASF Japan, trade name "Irgacure-184")
< example 1 >
[ production of adhesive sheet 1 (3-layer product) ]
Polyethylene terephthalate (manufactured by Tanson industries, Ltd.) having a thickness of 75 μm was used as the heavy-duty separator 3, and polyethylene terephthalate (manufactured by Tanson industries, Ltd.) having a thickness of 50 μm was used as the light-duty separator 4 and the temporary separator 6, and the adhesive sheet 1 was produced in the following order of (I) to (V).
(I) 60g of acrylic acid derivative polymer (A-1), 30.9g of isostearyl acrylate (ISTA), 5.0g of 4-hydroxybutyl acrylate (4HBA), 4.0g of side chain methacrylic acid-modified acrylate polymer (C-1), and 0.1g of 1-hydroxycyclohexyl phenyl ketone (I-184) were weighed and mixed with stirring to obtain an adhesive resin composition which was liquid at ordinary temperature.
(II) after coating the adhesive resin composition on a heavy-duty separator 3 to form a coating film, a temporary separator 6 was laminated on an adhesive layer 2, and the coating film was irradiated with ultraviolet raysThe plate was irradiated with ultraviolet light (4.0X 10)2mJ/cm2) Thus, a laminate in which the adhesive layer 2 is sandwiched between the heavy-peeling separator 3 and the temporary separator 6 is obtained. In addition, the thickness of the adhesive layer 2 is 1.5X 102The coating was adjusted in the μm mode.
(III) the laminate was cut with a rotary blade having a diameter of 72mm so as to have a size of 220mm × 180 mm.
(IV) the adhesive layer 2 and the temporary separator 6 in the cut laminate were cut with a rotary blade having a diameter of 72mm so as to have a size of 205mm × 160 mm. At this time, the heavy-release separator 3 was cut so that both edges on the long side extended 7.5mm from both edges on the long side of the adhesive layer 2 and both edges on the short side of the heavy-release separator 3 extended 10mm from both edges on the short side of the adhesive layer 2. In addition, a rotary punching device having a rotary blade with a diameter of 72mm was used for cutting in (III) and (IV).
(V) the temporary separator 6 was peeled off, and a light release separator 4 having a size of 215mm × 170mm was laminated on the adhesive layer 2. Thus, an adhesive sheet 1 was obtained. At this time, the light-peeling separator 4 was laminated such that both sides on the long side extended 5mm from both sides on the long side of the adhesive layer 2, and both sides on the short side of the light-peeling separator 4 extended 5mm from both sides on the short side of the adhesive layer 2.
< examples 2 to 11 and comparative examples 1 to 4 >
An adhesive sheet 1 was obtained in the same manner as in example 1, except that the compounding and the exposure amount were set to the conditions shown in table 1. In addition, the unit of the numerical value of the blending amount shown in table 1 is gram (g).
[ various evaluations ]
The adhesive sheets obtained in the examples and comparative examples were evaluated by the following (1) to (6).
(1) Measurement of glass transition temperature (Tg), shear storage modulus of elasticity, loss modulus of elasticity and tan
3 sheets obtained according to the above step (II) and having a thickness of 1.5X 102The adhesive layers of μm overlap to about 4.5X 102Mu.m thick, cut into a size of 10mm in width and 10mm in length, and a sample was prepared. 2 samples were prepared, and as shown in fig. 23, a sample S was sandwiched between the blade P1 at both ends and the blade P2 at the center by using a jig 100 to prepare a measurement sample. Then, the glass transition temperature (Tg), shear storage modulus of elasticity, loss modulus of elasticity and tan of the sample were measured using a wide-area dynamic viscoelasticity measuring apparatus (solid Analyzer RSA-II, manufactured by Rheometric Scientific). The determination conditions are a 'sharing sandwich mode, the frequency is 1.0Hz, the determination temperature range is-20-100 ℃, and the temperature rise speed is 5 ℃/min'.
(2) Difference of height landfill property
The adhesive sheet thus produced was cut into a size of 50mm in width and 80mm in length, and the polyethylene terephthalate FILM on one side of the adhesive sheet was peeled off and laminated with a cycloolefin polymer FILM (product name "ZEONOR FILM ZF 16", manufactured by Zeon corporation, Japan) having a size of 56mm × 86mm × 0.1mm (thickness) using a hand press roll (25 ℃, load: 4.9N (500 gf)). Then, the polyethylene terephthalate film on the other side of the adhesive sheet to which the cycloolefin polymer film was not bonded was peeled off, and a 56mm x 86mm x 0.7mm (thickness) glass substrate having a print layer (height difference) of a size of 9mm in width and 80 μm in thickness provided on the outer peripheral portion thereof was bonded to the adhesive sheet with the adhesive layer interposed therebetween for 60 seconds under conditions of 60 ℃ and 0.5MPa and a vacuum degree of 50Pa using a vacuum bonding apparatus (product name "TPL-0512 MH" manufactured by Takatori Co., Ltd.). Then, the film was autoclaved (45 ℃ C., 0.5MPa) for 10 minutes, and then irradiated with ultraviolet light (2.0X 10) from the cycloolefin polymer film surface side by using an ultraviolet irradiation apparatus (Eyegraphics Co., Ltd.)3mJ/cm2And an evaluation sample was prepared.
Using the evaluation sample, the appearance evaluation (bubbling, peeling) of the periphery of the printed layer (level difference) was performed with an optical microscope, and the level difference landfill property was judged according to the following evaluation criteria.
(evaluation criteria)
A: bubble-free and peeling
B: with bubbles or peeling on only 1 side
C: with bubbles or peeling off more than 2 sides
(3) Surface flatness
The adhesive sheet thus produced was cut into a size of 50mm in width and 80mm in length, and the polyethylene terephthalate FILM on one side of the adhesive sheet was peeled off and laminated with a cycloolefin polymer FILM (product name "ZEONOR FILM ZF 16", manufactured by Zeon corporation, Japan) having a size of 56mm × 86mm × 0.1mm (thickness) using a hand press roll (25 ℃, load: 4.9N (500 gf)). Next, the polyethylene terephthalate film on the other surface of the adhesive sheet to which the cycloolefin polymer film was not bonded was peeled off, and a 56mm × 86mm × 0.7mm (thickness) glass substrate having a print layer (height difference) with a width of 9mm and a thickness of 80 μm provided on the outer peripheral portion thereof was bonded so as to sandwich the adhesive layer for 60 seconds using a vacuum bonding apparatus under conditions of 60 ℃ at 0.5MPa and a vacuum degree of 50 Pa. Then, the film was autoclaved (45 ℃ C., 0.5MPa) for 10 minutes, and then irradiated with ultraviolet light at 2.0X 10 from the cycloolefin polymer film surface side by using an ultraviolet irradiation apparatus3mJ/cm2And an evaluation sample was prepared.
Using the evaluation sample, the surface shape of the peripheral portion of the printing layer (step height) on the cycloolefin polymer film side was measured by a surface roughness measuring instrument (product name "SE 3500" of shin & ltd., minisag) under the following conditions.
Shape of tip portion of diamond material: conical shape
Radius of the tip: 2 μm
Vertex angle: 60 DEG C
Measuring speed: 0.15 mm/sec
Measuring force: 0.75mN
Cutoff value: 0.8mm
Standard length: 0.8mm
Evaluation length: 10mm
The measurement was performed continuously for 5mm on the surface of the printed layer and 5mm on the surface of the unprinted portion, and the surface flatness was judged from the difference (Δ t in fig. 25) between the measured values of the surface of the printed layer and the surface of the unprinted portion according to the following evaluation criteria.
(evaluation criteria)
A: less than 20 μm
B: 20 μm or more but less than 40 μm
C: more than 40 μm
(4) Bleeding property
The adhesive sheet thus produced was cut into a size of 50mm in width and 80mm in length, the polyethylene terephthalate film on one side of the adhesive sheet was peeled off, and the peeled adhesive sheet was bonded to a cycloolefin polymer film having a size of 56mm × 86mm × 0.1mm (thickness) by using a hand press roll (25 ℃, load: 4.9N (500gf)), and then the diagonal length of the adhesive sheet portion was measured. Next, the other side of the polyethylene terephthalate film to which the cycloolefin polymer film was not bonded was peeled off, and then a 56mm × 86mm × 0.7mm (thickness) glass substrate having a print layer (height difference) of 9mm width and 80 μm thickness provided on the outer peripheral portion thereof was bonded to the adhesive layer with a vacuum bonding apparatus at 60 ℃ under 0.5MPa and a vacuum degree of 50Pa for 60 seconds, and then left to stand at 25 ℃ for 30 minutes to prepare an evaluation sample.
The diagonal length of the adhesive sheet portion of the evaluation sample was measured, and the bleeding property was determined from the amount of change (increase) in the diagonal length of the adhesive sheet portion before and after bonding to the glass substrate according to the following evaluation criteria.
(evaluation criteria)
A: less than 1.5mm
B: 1.5mm or more but less than 3mm
C: over 3mm
(5) Optical characteristics
(A) Determination of L, a, b
The adhesive sheet thus produced was cut into a size of 40mm in width and 100mm in length, and the polyethylene terephthalate film on one side of the adhesive sheet was peeled off and bonded to a glass substrate (soda-lime glass) having a size of 50mm × 100mm × 3mm (thickness) using a hand-press roll (25 ℃, load: 4.9N (500 gf)). Subsequently, the polyethylene terephthalate film on the opposite side of the adhesive sheet was peeled off, and the measurement was performed using a spectrophotometer (product name "SQ-2000" manufactured by Nippon Denshoku industries Co., Ltd.) with the adhesive layer side as the light source side.
(B) Measurement of turbidity (haze)
The adhesive sheet thus produced was cut into a size of 40mm in width and 100mm in length, and the polyethylene terephthalate film on one side of the adhesive sheet was peeled off and bonded to a glass substrate (soda-lime glass) having a size of 50mm × 100mm × 3mm (thickness) using a hand-press roll (25 ℃, load: 4.9N (500 gf)). Subsequently, the polyethylene terephthalate film on the opposite side of the adhesive sheet was peeled off, and the measurement was carried out using a haze meter (product name "NDH-5000" manufactured by Nippon Denshoku industries Co., Ltd.) in accordance with JIS K7136 with the adhesive layer side as the light source side.
Haze (%) - (Td/Tt) × 100
Td: diffusion transmittance Tt: total light transmittance
(6) Determination of dielectric constant
The adhesive sheet thus produced was irradiated with ultraviolet light at 2.0X 10 using an ultraviolet irradiation apparatus3mJ/cm2Then, the sheet was cut into a size of 50mm in width and 50mm in length, and the polyethylene terephthalate film on one side of the adhesive sheet was peeled off and bonded to a copper foil (thickness: 100 mm. times.100 mm. times.18 μm) in a size of 100 mm. times.100 mm. times.18 μm so that the adhesive sheet did not bleed outTrade name "SLP-18", manufactured by Takara Shuzo). Then, the polyethylene terephthalate film on the other surface of the adhesive sheet was peeled off, and the adhesive sheet was bonded to the glossy surface side of a copper foil (manufactured by Nippon electrolytic Co., Ltd., trade name: SLP-18) having a size of 20 mm. times.20 mm. times.18 μm (thickness) so that the adhesive sheet did not bleed out. The terminal was brought into contact with substantially central portions of 100mm × 100mm copper foil and 20mm × 20mm copper foil, and the electrostatic capacitance (C) was measured by a dielectric constant measuring apparatus (product name "LCR meter E4980" manufactured by Agilent Technologies) at 25 ℃ and a frequency of 100kHz, and the dielectric constant was obtained by substituting the following equationr. Wherein,0the dielectric constant of vacuum and d the thickness of the adhesive layer. The evaluation results of the examples and comparative examples are shown in table 1.
C＝0×r×(20mm×20mm)/d
[ Table 1]
< example 12 >
[ production of adhesive sheet 1 (4-layer product) ]
(I) A liquid adhesive resin composition was obtained in the same manner as in example 1.
(II) after coating the adhesive resin composition on one side of a heavy-duty separator 3 to form a coating film, a temporary separator 6 was laminated on the coating film, and irradiated with ultraviolet rays (400 mJ/cm)2) Then, an acrylic adhesive (product name "HITALEX K-6040" manufactured by hitachi chemical) was laminated on the other surface of the heavy-release separator 3, and a carrier film 5 was laminated thereon.
(III) the heavy-release separator 3, the adhesive layer 2, the temporary separator 6, and the carrier film 5 were cut so as to be 220mm × 180 mm.
(IV) the adhesive layer 2, the heavy peeling separator 3, and the temporary separator 6 were cut with a rotary blade having a diameter of 72mm so as to have a size of 205mm × 160 mm. A rotary punching device having a rotary blade with a diameter of 72mm was used for shearing. At this time, the carrier film 5 was cut so that both edges on the long side extended 7.5mm from both edges on the long side of the adhesive layer 2 and both edges on the short side of the carrier film 5 extended 10mm from both edges on the short side of the adhesive layer 2.
(V) the temporary separator 6 was peeled off, and a light release separator 4 having a size of 215mm × 170mm was laminated on the adhesive layer 2. Thus, an adhesive sheet 1 (4-layer product) was obtained. At this time, the light-peeling separator 4 was laminated such that both sides on the long side extended 5mm from both sides on the long side of the adhesive layer 2, and both sides on the short side of the light-peeling separator 4 extended 5mm from both sides on the short side of the adhesive layer 2.
The same evaluation as that of the adhesive sheet 1 (3-layer product) was performed for the adhesive sheet 1 (4-layer product), and the results were: an adhesive sheet having a desired shape can be produced, and is excellent in any of the step filling property, the surface flatness, the low dielectric constant and the appearance as in example 1.
Industrial applicability of the invention
According to the present invention, an adhesive sheet for an image display device can be provided which has an adhesive layer having excellent transparency, handleability, level difference filling properties, and surface flatness, an appropriate dielectric constant, and excellent visibility. Further, by promoting the crosslinking reaction of the adhesive layer after the base material or the like is bonded, the adhesive force and holding force of the adhesive layer itself can be improved. Since the device incorporating the adhesive layer exhibits high reliability, the adhesive sheet of the present invention is suitable for use in an image display device. In particular, the sheet material is useful as a sheet material used when filling between an information input device such as a touch panel and a transparent protective plate.
Description of the symbols
1 adhesive sheet, 2 adhesive layer, 3 heavy release separator, 4 light release separator, 5 carrier film, 6 temporary separator, 2a, 3a, 4a outer edge, 3B, 5B adhesive layer side surface, 3c, 5c cut-out portion, 10 base material film, B blade, 40 transparent protective plate (glass or plastic substrate), 7 image display unit, 12 liquid crystal display unit, 20, 22 polarizing plate, 30 touch panel, 31, 32 transparent resin layer, 50 backlight system, 60 step portion, 100 jig.
Claims (10)
1. An adhesive sheet for an image display device, comprising an adhesive layer and a pair of base material layers laminated so as to sandwich the adhesive layer,
the adhesive layer contains a structural unit derived from stearyl (meth) acrylate as a main component, and has a haze of 1.5% or less.
2. An adhesive sheet for an image display device, comprising an adhesive layer, a1 st and a2 nd base material layers laminated so as to sandwich the adhesive layer, and a carrier layer further laminated on the 2 nd base material layer,
the outer edges of the 1 st base material layer and the carrier layer protrude further to the outside than the outer edge of the adhesive layer,
the adhesive layer contains a structural unit derived from stearyl (meth) acrylate as a main component, and has a haze of 1.5% or less.
3. The adhesive sheet for image display device according to claim 1 or 2, wherein the thickness of the adhesive layer is 1.0 x 102μm～5.0×102μm。
4. The adhesive sheet for image display devices according to any one of claims 1 to 3, wherein the adhesive layer has a tan of 1.2 to 2 at 40 to 80 ℃.
5. The adhesive sheet for image display devices according to any one of claims 1 to 4, wherein the adhesive layer is formed from an adhesive resin composition containing (A) an acrylic acid derivative polymer, (B) an acrylic acid derivative, (C) a crosslinking agent, and (D) a photopolymerization initiator,
the acrylic acid derivative polymer (A) contains a structural unit derived from stearyl (meth) acrylate, and the acrylic acid derivative (B) contains stearyl (meth) acrylate.
6. A method for manufacturing an image display device includes the steps of:
a step of obtaining a laminate by bonding objects to be bonded to each other via the adhesive layer provided in the adhesive sheet for an image display device according to any one of claims 1 to 5;
a step of subjecting the laminate to heat-pressure treatment at 40 to 80 ℃ and 0.3 to 0.8 MPa; and
and irradiating the laminate with ultraviolet light from one side of any one of the adherends.
7. The method for manufacturing an image display device according to claim 6, wherein the adherend is at least 2 selected from a transparent protective plate, a touch panel, and a liquid crystal display unit.
8. An image display device having a laminate comprising an image display unit, a transparent protective plate, and an adhesive layer present between the image display unit and the transparent protective plate, wherein the adhesive layer contains a structural unit derived from stearyl (meth) acrylate as a main component, and the adhesive layer has a haze of 1.5% or less.
9. An image display device having a laminate comprising an image display unit, a touch panel, a transparent protective plate, and an adhesive layer present between the touch panel and the transparent protective plate, wherein the adhesive layer contains a structural unit derived from stearyl (meth) acrylate as a main component, and the adhesive layer has a haze of 1.5% or less.
10. The image display device according to claim 8 or 9, wherein the image display unit, the touch panel, or the transparent protective plate has a step portion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-228255 | 2012-10-15 | ||
| JP2012228255 | 2012-10-15 | ||
| PCT/JP2013/077840 WO2014061611A1 (en) | 2012-10-15 | 2013-10-11 | Adhesive sheet for image display device, method for manufacturing image display device, and image display device |
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| Publication Number | Publication Date |
|---|---|
| CN104718262A true CN104718262A (en) | 2015-06-17 |
| CN104718262B CN104718262B (en) | 2017-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201380052883.4A Expired - Fee Related CN104718262B (en) | 2012-10-15 | 2013-10-11 | Device used for image display adhesion sheet material, the manufacture method of image display device and image display device |
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| Country | Link |
|---|---|
| US (1) | US20150299520A1 (en) |
| JP (1) | JP6265907B2 (en) |
| KR (1) | KR20150072400A (en) |
| CN (1) | CN104718262B (en) |
| TW (1) | TW201418404A (en) |
| WO (1) | WO2014061611A1 (en) |
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| JP2013129789A (en) * | 2011-12-22 | 2013-07-04 | Nitto Denko Corp | Adhesive, adhesive layer, and adhesive sheet |
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- 2013-10-11 KR KR1020157005040A patent/KR20150072400A/en not_active Application Discontinuation
- 2013-10-11 CN CN201380052883.4A patent/CN104718262B/en not_active Expired - Fee Related
- 2013-10-11 WO PCT/JP2013/077840 patent/WO2014061611A1/en active Application Filing
- 2013-10-11 US US14/435,580 patent/US20150299520A1/en not_active Abandoned
- 2013-10-11 JP JP2014542119A patent/JP6265907B2/en active Active
- 2013-10-14 TW TW102137002A patent/TW201418404A/en unknown
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| WO2004038464A1 (en) * | 2002-10-28 | 2004-05-06 | Nitto Denko Corporation | Adhesive optical film, method for manufacturing adhesive optical film and image display |
| WO2011112447A2 (en) * | 2010-03-09 | 2011-09-15 | 3M Innovative Properties Company | Heat activated optically clear adhesive for bonding display panels |
| CN103492516A (en) * | 2011-05-02 | 2014-01-01 | 日东电工株式会社 | Adhesive, adhesive layer, and adhesive sheet |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109073813A (en) * | 2016-04-20 | 2018-12-21 | 日东电工株式会社 | Polarizing coating and its manufacturing method, optical film and image display device |
| CN109073810A (en) * | 2016-04-20 | 2018-12-21 | 日东电工株式会社 | Polarizing coating and its manufacturing method, optical film and image display device |
| CN109073813B (en) * | 2016-04-20 | 2021-08-31 | 日东电工株式会社 | Polarizing film, method for producing same, optical film, and image display device |
| CN109073810B (en) * | 2016-04-20 | 2021-11-23 | 日东电工株式会社 | Polarizing film, method for producing same, optical film, and image display device |
| CN114200567A (en) * | 2016-04-20 | 2022-03-18 | 日东电工株式会社 | Polarizing film, method for producing same, optical film, and image display device |
| CN114200567B (en) * | 2016-04-20 | 2024-08-23 | 日东电工株式会社 | Polarizing film, method for producing same, optical film, and image display device |
| CN112041914A (en) * | 2018-04-24 | 2020-12-04 | 住友化学株式会社 | Optical laminate and method for producing same |
Also Published As
| Publication number | Publication date |
|---|---|
| US20150299520A1 (en) | 2015-10-22 |
| JPWO2014061611A1 (en) | 2016-09-05 |
| TW201418404A (en) | 2014-05-16 |
| KR20150072400A (en) | 2015-06-29 |
| WO2014061611A1 (en) | 2014-04-24 |
| JP6265907B2 (en) | 2018-01-24 |
| CN104718262B (en) | 2017-03-08 |
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